gnuplot-info — For questions and discussion about gnuplot

[Gnuplot-info] plotting rgb images

[Martin B. <m.b...@st...>]

Hello,

I want to plot images with gnuplot 4.2.4-6.
I wrote a small C program that extracts RGB values for each pixel and
stores it to a ASCII-file which should be supported.
The first column is the x-position, the second the y-position, the rest
are the rgb values:
0 0 255 255 255
1 0 255 255 255
2 0 255 255 255
3 0 255 255 255
4 0 255 255 255
5 0 255 255 255
6 0 255 255 255
7 0 255 255 255
8 0 255 255 255
9 0 255 255 255
...
The first pixels are all white.
First question: Should I use a range from 0 to 255 or from 0 to 1?

Second question: How can I now plot that data?
In the demo scripts I can only find examples with binary data.
I tried many options similar to:
plot 'image.rgb' format='%uchar%uchar%uchar' using ($3+$4+$5) with
rgbimage
and
plot 'image.rgb' array=(1852x917) with rgbimage
when using implicit xy-coordinates (without the first columns).

I'm sure someone can point me to the solution.

Thanks for your help!

Martin

Re: [Gnuplot-info] points too far from the average not enough considered in the fit procedure

[Hans-Bernhard B. <HBB...@t-...>]

parigigi wrote:

> Particularly if each point weights equal, the fitting procedure "ignores" a
> lot points far from the others, 

No it doesn't.  Being "far from others" bears no relevance at all to how 
a fit is supposed to handle data points.  It's _only_ about how far they 
are from the model function, and then only in the z direction.

> but since I deal with resonances, I am
> interested in the converse: something that weights much more points far from
> the average.

So supply your own weights, instead of letting gnuplot default to them 
all being equal.  The documentation is clear enough about how to do 
that, I think.  If you think otherwise, tell where you got lost.

> Is there a way to change automatically the weight of each point in a way
> that fitted surface will be closer to them?

Of course not!  Doing that automatically would render whatever parameter 
  you might end up extracting completely meaningless.

[Gnuplot-info] points too far from the average not enough considered in the fit procedure

[parigigi <par...@gm...>]

Hi all,

After a long campaign of measurement I got a set of data which I want to
display in a 3D graph.

My main goal is to fit these data with a surface, in order to extract some
parameters. "fit" tool is working, but I don't know how to control it.

Particularly if each point weights equal, the fitting procedure "ignores" a
lot points far from the others, but since I deal with resonances, I am
interested in the converse: something that weights much more points far from
the average.

Is there a way to change automatically the weight of each point in a way
that fitted surface will be closer to them?


Thanks a lot to everyone
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Re: [Gnuplot-info] ploting two vertical column

[shasa <sha...@gm...>]

thanks so much that was really kind of u.


Thomas Sefzick wrote:
> 
> sorry, i didn't took into account that there are backslashes in the
> path, try
> plot 'C:\Users\nimda\Desktop\tri.txt'
> 
> 
> shasa wrote:
>> 
>> i wrote that but i still have another error , the message after typing
>> that is:
>> 
>> plot "C:\Users\nimda\Desktop\tri.txt"
>>          warning: Skipping unreadable file "C:Users
>> imdaDesktop     ri.txt"
>>          No data in plot 
>> !
>> 
>> 
>> 
>> 
>> 
>> Thomas Sefzick wrote:
>>> 
>>> it seems that you tried to feed the data into into gnuplot
>>> directly, without any 'plot' command.
>>> 
>>> start gnuplot and at the gnuplot prompt type
>>> plot "C:\Users\nimda\Desktop\tri.txt"
>>> 
>>> 
>>> shasa wrote:
>>>> 
>>>> i am goining to plot a two column of vertical data as X and Y axis but
>>>> after loading the data file i have this error:
>>>> gnuplot> 260          150
>>>>          ^
>>>>          "C:\Users\nimda\Desktop\tri.txt", line 1: invalid command
>>>> the data file is about 10000 ,that are like this:
>>>> 260          150
>>>> 129          374
>>>> 323          336
>>>> 160          167
>>>> 79          382
>>>> 299          341
>>>> 149          470
>>>> ...
>>>> would you plaase help me to correct this error!
>>>> thanks alot
>>>> ShaSa
>>>> 
>>> 
>>> 
>> 
>> 
> 
> 
=)
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Re: [Gnuplot-info] pm3d map and nosurface still produces surface mesh

[Hans-Bernhard B. <HBB...@t-...>]

Thomas Pfrommer wrote:

> I try to get rid of the surface mesh but somehow fail.

gnuplot is doing what you told it --- and you explicitly requested a 
surface mesh by these commands:

> set style line 110 lt 9 lw 0.05
> set pm3d at b hidden3d 110

So that's what you get.  I suggest you re-visit "help pm3d" and find out 
why this does something you didn't want.

Re: [Gnuplot-info] how to set line styles for the different line (colors and patterns) for example for 20 different color lines

[Rajarshi T. <raj...@gm...>]

Use

plot "something" w l lt 1 lc rgb "color"

where lc = linecolor
and besides rgb you have "color", which can be some standard color (e.g.
"red"), or it can be an html color code ("#0000ff" for blue).
The color code can be generated by some intuition as these are
superpositions of red, green and blue, or seen from various applications
like, kcolorpick in kde.

Also when u change desktop background, the color selection options give u
these color codes :-).


Rajarshi Tiwari


On Sun, Jan 31, 2010 at 2:02 AM, Peggy Li <peg...@go...> wrote:

> Hi
>
> I want to set line styles for 20 different lines (i.e., 20 different colors
> with different line patterns) using "lt" but for 20 different colors for
> postscript. Would appreciate if you can could advise me how to do it.
>
> thanks.
>
> ------------------------------------------------------------------------------
> The Planet: dedicated and managed hosting, cloud storage, colocation
> Stay online with enterprise data centers and the best network in the
> business
> Choose flexible plans and management services without long-term contracts
> Personal 24x7 support from experience hosting pros just a phone call away.
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>

[Gnuplot-info] pm3d map and nosurface still produces surface mesh

[Thomas P. <pfr...@ph...>]

Hello,

I try to get rid of the surface mesh but somehow fail. I am drawing a 2d 
colored map plus contour lines (that I am also using outside gnuplot 
hence the outfile). It draws the contour nicely, also the map looks 
nice, however I get a quite bright yellow grid on top of the map that I 
am not able to eliminate. I hope you can hep me. I already looked in the 
help files and also the internet but was not successful.

Thanks
Thomas

Here is my code:

unset clabel
unset key
set contour base
set cntrparam bspline
set cntrparam points 6
set cntrparam order 5
set cntrparam levels discrete 0.19

unset surface
set table 'outfile.txt'
splot "20080722_40.conv" matrix with lines
set out

set yrange[650:700]
set xrange[620:680]
set terminal png

set style line 110 lt 9 lw 0.05
set pm3d at b hidden3d 110
set palette 
defined(-0.1"black",0"violet",0.1"black",0.2"yellow",0.35"red",0.5"white")
unset hidden3d
unset surf

set output '20080722_40_c.png'
set pm3d map
splot "20080722_40.conv" matrix with line lt 5 lw 2

quit

Re: [Gnuplot-info] ploting two vertical column

[Thomas S. <t.s...@fz...>]

sorry, i didn't took into account that there are backslashes in the
path, try
plot 'C:\Users\nimda\Desktop\tri.txt'


shasa wrote:
> 
> i wrote that but i still have another error , the message after typing
> that is:
> 
> plot "C:\Users\nimda\Desktop\tri.txt"
>          warning: Skipping unreadable file "C:Users
> imdaDesktop     ri.txt"
>          No data in plot 
> !
> 
> 
> 
> 
> 
> Thomas Sefzick wrote:
>> 
>> it seems that you tried to feed the data into into gnuplot
>> directly, without any 'plot' command.
>> 
>> start gnuplot and at the gnuplot prompt type
>> plot "C:\Users\nimda\Desktop\tri.txt"
>> 
>> 
>> shasa wrote:
>>> 
>>> i am goining to plot a two column of vertical data as X and Y axis but
>>> after loading the data file i have this error:
>>> gnuplot> 260          150
>>>          ^
>>>          "C:\Users\nimda\Desktop\tri.txt", line 1: invalid command
>>> the data file is about 10000 ,that are like this:
>>> 260          150
>>> 129          374
>>> 323          336
>>> 160          167
>>> 79          382
>>> 299          341
>>> 149          470
>>> ...
>>> would you plaase help me to correct this error!
>>> thanks alot
>>> ShaSa
>>> 
>> 
>> 
> 
> 

-- 
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Re: [Gnuplot-info] ploting two vertical column

[shasa <sha...@gm...>]

i wrote that but i still have another error , the message after typing that
is:

plot "C:\Users\nimda\Desktop\tri.txt"
         warning: Skipping unreadable file "C:Users
imdaDesktop     ri.txt"
         No data in plot 
!





Thomas Sefzick wrote:
> 
> it seems that you tried to feed the data into into gnuplot
> directly, without any 'plot' command.
> 
> start gnuplot and at the gnuplot prompt type
> plot "C:\Users\nimda\Desktop\tri.txt"
> 
> 
> shasa wrote:
>> 
>> i am goining to plot a two column of vertical data as X and Y axis but
>> after loading the data file i have this error:
>> gnuplot> 260          150
>>          ^
>>          "C:\Users\nimda\Desktop\tri.txt", line 1: invalid command
>> the data file is about 10000 ,that are like this:
>> 260          150
>> 129          374
>> 323          336
>> 160          167
>> 79          382
>> 299          341
>> 149          470
>> ...
>> would you plaase help me to correct this error!
>> thanks alot
>> ShaSa
>> 
> 
> 

-- 
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Re: [Gnuplot-info] ploting two vertical column

[Thomas S. <t.s...@fz...>]

it seems that you tried to feed the data into into gnuplot
directly, without any 'plot' command.

start gnuplot and at the gnuplot prompt type
plot "C:\Users\nimda\Desktop\tri.txt"


shasa wrote:
> 
> i am goining to plot a two column of vertical data as X and Y axis but
> after loading the data file i have this error:
> gnuplot> 260          150
>          ^
>          "C:\Users\nimda\Desktop\tri.txt", line 1: invalid command
> the data file is about 10000 ,that are like this:
> 260          150
> 129          374
> 323          336
> 160          167
> 79          382
> 299          341
> 149          470
> ...
> would you plaase help me to correct this error!
> thanks alot
> ShaSa
> 

-- 
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[Gnuplot-info] setting terminal.

[Gupta <gup...@gm...>]

Hi,
I am very new to GNU plot.i installed in gnuplot linux machine.
when i give command gnuplot,
it is showing
G N U P L O T
        Version 4.4 patchlevel 0-rc1
        last modified Sat Nov 28 14:34:01 PST 2009
        System: Linux 2.6.18-53.el5

        Copyright (C) 1986-1993, 1998, 2004, 2007-2009
        Thomas Williams, Colin Kelley and many others

        gnuplot home:     http://www.gnuplot.info
        faq, bugs, etc:   type "help seeking-assistance"
        immediate help:   type "help"
        plot window:      hit 'h'

Terminal type set to 'unknown'

Because of this i m not able to view plotted graph .i want to set it to
X11.how can i set  that terminal.can u help me in this aspect.
while i m trying to set terminal .it is giving error shown below.

               set terminal X11
                      ^
         unknown or ambiguous terminal type; type just 'set terminal' for a
list





-- 
Thanks and Regards,
Kishor Gupta.
Project Engineer,
CDAC,Bangalore,
Ph.no:09538722172
If a drop of water falls on lake, it loses its identity.

If it falls on a rose, it shines.

If it falls on a shell, it becomes a pearl.

The drop is the same but the company matters

[Gnuplot-info] ploting two vertical column

[shasa <sha...@gm...>]

i am goining to plot a two column of vertical data as X and Y axis but after
loading the data file i have this error:
gnuplot> 260          150
         ^
         "C:\Users\nimda\Desktop\tri.txt", line 1: invalid command
the data file is about 10000 ,that are like this:
260          150
129          374
323          336
160          167
79          382
299          341
149          470
...
would you plaase help me to correct this error!
thanks alot
ShaSa
-- 
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Re: [Gnuplot-info] 2 graphs

[lozwell <lo...@ve...>]

Awesome, Thanks!!!



Thomas Sefzick wrote:
> 
> set ylabel "Y-label"
> set multiplot layout 2,1
> plot "test.dat" u 1:2 w l
> set xlabel "X-label"
> plot "test.dat2" u 1:2 w l lt 2
> unset multiplot
> 
> 
> lozwell wrote:
>> 
>> I am looking for a way to plot two data files on top of each other. For
>> instance, basically two rectangles on top of each other, both with their
>> own y-axis but sharing the x-axis. Is this possible?
>> 
>> FOr example, the following has both red & green sharing the same space,
>> but I'd like the lower half of the graph to show the red & the upper half
>> of the graph to show the green, with a black line seperating the two. Any
>> help appreciated!!!
>> 
>> test.dat
>> 1 0.1
>> 2 0.3
>> 3 0.4
>> 4 0.6
>> 5 0.8
>> 
>> test.dat2
>> 1 0.1
>> 2 0.2
>> 3 0.4
>> 4 0.5
>> 5 0.7
>> 
>> gnuplot.conf
>> set terminal png
>> set out "test.png"
>> set xlabel "X-label"
>> set ylabel "Y-label"
>> plot "test.dat" u 1:2 w l, "test.dat2" u 1:2 w l
>> 
>> 
> 
> 

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Re: [Gnuplot-info] Factorial issue

[jody <jod...@gm...>]

I completely agree with you for the general case, but apparently here the
accuracy is sufficient to give a good result. In fact, all expressions
of the form
  (n+1)!/n!
for n up to 169 evaluate correctly on my machine (171! is just outside
of the range of a double)

On Mon, Feb 8, 2010 at 5:27 PM, Philipp K. Janert <ja...@ie...> wrote:
>
> But it is still meaningless, because you are
> dividing by an almost equally large number
> to obtain a nuber 155 orders of magnitude (!)
> smaller. Round-off error will kill you.
>
> On Monday 08 February 2010 08:18:25 am jody wrote:
>> Hi
>> Unless some gnuplot versions work with 32bit floats,
>> I'm surprised that it wouldn't work, because 100! = 9.33262154439442e+157
>> which is well inside the range of a (64bit) double...
>>
>> Jody
>>
>> >> > exponentiate at the end (if needed).
>>
>> On Mon, Feb 8, 2010 at 5:04 PM, Philipp K. Janert <ja...@ie...> wrote:
>> > On Monday 08 February 2010 07:53:24 am Tim Wojtulewicz wrote:
>> >> On Mon, Feb 08, 2010 at 07:15:21AM -0800, Philipp K. Janert wrote:
>> >> > On Sunday 07 February 2010 11:07:07 am Tim Wojtulewicz wrote:
>> >> > > I'm working with a fairly complicated function, one part of which is
>> >> > > the division of two factorials.  I'm having an issue with though,
>> >> > > because gnuplot keeps returning NaN for what should be a simple
>> >> > > division.  It will return NaN for something as simple as 100!/99!,
>> >> > > which should just be 100. Is there a reason for this, or an easy way
>> >> > > to fix it?  Thanks.
>> >> >
>> >> > The intermediate results overflow, despite the fact that
>> >> > the final result is of meaningful size.
>> >> >
>> >> > Either work out the cancellations analytically, or work with
>> >> > logarithms of all quantities (Stirlings approximation!), and
>> >> > exponentiate at the end (if needed).
>> >>
>> >> So is this a version issue then?  The reply from Thomas seems like his
>> >> is working correctly.  I'm working with version 4.2.5 on OS X 10.6.
>> >> It's odd that his would work, and yet mine won't.
>> >
>> > If anything, this is a platform issue. Quite frankly,
>> > I was surprised that it worked for anybody. (It doesn't
>> > for me.)
>> >
>> > But this is besides the point: if you need factorials
>> > of large numbers (>10), then you need to find ways
>> > to tame overflow issues. Unless you are working in
>> > infinite precision integer arithmetic, which is not
>> > something that gnuplot does.
>> >
>> >> Tim
>> >>
>> >> ------------------------------------------------------------------------
>> >>--- --- The Planet: dedicated and managed hosting, cloud storage,
>> >> colocation Stay online with enterprise data centers and the best network
>> >> in the business Choose flexible plans and management services without
>> >> long-term contracts Personal 24x7 support from experience hosting pros
>> >> just a phone call away. http://p.sf.net/sfu/theplanet-com
>> >> _______________________________________________
>> >> gnuplot-info mailing list
>> >> gnu...@li...
>> >> https://lists.sourceforge.net/lists/listinfo/gnuplot-info
>> >
>> > -------------------------------------------------------------------------
>> >----- The Planet: dedicated and managed hosting, cloud storage, colocation
>> > Stay online with enterprise data centers and the best network in the
>> > business Choose flexible plans and management services without long-term
>> > contracts Personal 24x7 support from experience hosting pros just a phone
>> > call away. http://p.sf.net/sfu/theplanet-com
>> > _______________________________________________
>> > gnuplot-info mailing list
>> > gnu...@li...
>> > https://lists.sourceforge.net/lists/listinfo/gnuplot-info
>>
>> ---------------------------------------------------------------------------
>>--- The Planet: dedicated and managed hosting, cloud storage, colocation
>> Stay online with enterprise data centers and the best network in the
>> business Choose flexible plans and management services without long-term
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>> gnuplot-info mailing list
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>> https://lists.sourceforge.net/lists/listinfo/gnuplot-info
>
>
>
> ------------------------------------------------------------------------------
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>

Re: [Gnuplot-info] Factorial issue

[Philipp K. J. <ja...@ie...>]

But it is still meaningless, because you are
dividing by an almost equally large number
to obtain a nuber 155 orders of magnitude (!)
smaller. Round-off error will kill you.

On Monday 08 February 2010 08:18:25 am jody wrote:
> Hi
> Unless some gnuplot versions work with 32bit floats,
> I'm surprised that it wouldn't work, because 100! = 9.33262154439442e+157
> which is well inside the range of a (64bit) double...
>
> Jody
>
> >> > exponentiate at the end (if needed).
>
> On Mon, Feb 8, 2010 at 5:04 PM, Philipp K. Janert <ja...@ie...> wrote:
> > On Monday 08 February 2010 07:53:24 am Tim Wojtulewicz wrote:
> >> On Mon, Feb 08, 2010 at 07:15:21AM -0800, Philipp K. Janert wrote:
> >> > On Sunday 07 February 2010 11:07:07 am Tim Wojtulewicz wrote:
> >> > > I'm working with a fairly complicated function, one part of which is
> >> > > the division of two factorials.  I'm having an issue with though,
> >> > > because gnuplot keeps returning NaN for what should be a simple
> >> > > division.  It will return NaN for something as simple as 100!/99!,
> >> > > which should just be 100. Is there a reason for this, or an easy way
> >> > > to fix it?  Thanks.
> >> >
> >> > The intermediate results overflow, despite the fact that
> >> > the final result is of meaningful size.
> >> >
> >> > Either work out the cancellations analytically, or work with
> >> > logarithms of all quantities (Stirlings approximation!), and
> >> > exponentiate at the end (if needed).
> >>
> >> So is this a version issue then?  The reply from Thomas seems like his
> >> is working correctly.  I'm working with version 4.2.5 on OS X 10.6.
> >> It's odd that his would work, and yet mine won't.
> >
> > If anything, this is a platform issue. Quite frankly,
> > I was surprised that it worked for anybody. (It doesn't
> > for me.)
> >
> > But this is besides the point: if you need factorials
> > of large numbers (>10), then you need to find ways
> > to tame overflow issues. Unless you are working in
> > infinite precision integer arithmetic, which is not
> > something that gnuplot does.
> >
> >> Tim
> >>
> >> ------------------------------------------------------------------------
> >>--- --- The Planet: dedicated and managed hosting, cloud storage,
> >> colocation Stay online with enterprise data centers and the best network
> >> in the business Choose flexible plans and management services without
> >> long-term contracts Personal 24x7 support from experience hosting pros
> >> just a phone call away. http://p.sf.net/sfu/theplanet-com
> >> _______________________________________________
> >> gnuplot-info mailing list
> >> gnu...@li...
> >> https://lists.sourceforge.net/lists/listinfo/gnuplot-info
> >
> > -------------------------------------------------------------------------
> >----- The Planet: dedicated and managed hosting, cloud storage, colocation
> > Stay online with enterprise data centers and the best network in the
> > business Choose flexible plans and management services without long-term
> > contracts Personal 24x7 support from experience hosting pros just a phone
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> > _______________________________________________
> > gnuplot-info mailing list
> > gnu...@li...
> > https://lists.sourceforge.net/lists/listinfo/gnuplot-info
>
> ---------------------------------------------------------------------------
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> business Choose flexible plans and management services without long-term
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Re: [Gnuplot-info] Factorial issue

[jody <jod...@gm...>]

Hi
Unless some gnuplot versions work with 32bit floats,
I'm surprised that it wouldn't work, because 100! = 9.33262154439442e+157
which is well inside the range of a (64bit) double...

Jody

>> > exponentiate at the end (if needed).

On Mon, Feb 8, 2010 at 5:04 PM, Philipp K. Janert <ja...@ie...> wrote:
> On Monday 08 February 2010 07:53:24 am Tim Wojtulewicz wrote:
>> On Mon, Feb 08, 2010 at 07:15:21AM -0800, Philipp K. Janert wrote:
>> > On Sunday 07 February 2010 11:07:07 am Tim Wojtulewicz wrote:
>> > > I'm working with a fairly complicated function, one part of which is
>> > > the division of two factorials.  I'm having an issue with though,
>> > > because gnuplot keeps returning NaN for what should be a simple
>> > > division.  It will return NaN for something as simple as 100!/99!,
>> > > which should just be 100. Is there a reason for this, or an easy way to
>> > > fix it?  Thanks.
>> >
>> > The intermediate results overflow, despite the fact that
>> > the final result is of meaningful size.
>> >
>> > Either work out the cancellations analytically, or work with
>> > logarithms of all quantities (Stirlings approximation!), and
>> > exponentiate at the end (if needed).
>>
>> So is this a version issue then?  The reply from Thomas seems like his
>> is working correctly.  I'm working with version 4.2.5 on OS X 10.6.
>> It's odd that his would work, and yet mine won't.
>
> If anything, this is a platform issue. Quite frankly,
> I was surprised that it worked for anybody. (It doesn't
> for me.)
>
> But this is besides the point: if you need factorials
> of large numbers (>10), then you need to find ways
> to tame overflow issues. Unless you are working in
> infinite precision integer arithmetic, which is not
> something that gnuplot does.
>
>>
>> Tim
>>
>> ---------------------------------------------------------------------------
>>--- The Planet: dedicated and managed hosting, cloud storage, colocation
>> Stay online with enterprise data centers and the best network in the
>> business Choose flexible plans and management services without long-term
>> contracts Personal 24x7 support from experience hosting pros just a phone
>> call away. http://p.sf.net/sfu/theplanet-com
>> _______________________________________________
>> gnuplot-info mailing list
>> gnu...@li...
>> https://lists.sourceforge.net/lists/listinfo/gnuplot-info
>
>
>
> ------------------------------------------------------------------------------
> The Planet: dedicated and managed hosting, cloud storage, colocation
> Stay online with enterprise data centers and the best network in the business
> Choose flexible plans and management services without long-term contracts
> Personal 24x7 support from experience hosting pros just a phone call away.
> http://p.sf.net/sfu/theplanet-com
> _______________________________________________
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Re: [Gnuplot-info] 2 graphs

[Thomas S. <t.s...@fz...>]

set ylabel "Y-label"
set multiplot layout 2,1
plot "test.dat" u 1:2 w l
set xlabel "X-label"
plot "test.dat2" u 1:2 w l lt 2
unset multiplot


lozwell wrote:
> 
> I am looking for a way to plot two data files on top of each other. For
> instance, basically two rectangles on top of each other, both with their
> own y-axis but sharing the x-axis. Is this possible?
> 
> FOr example, the following has both red & green sharing the same space,
> but I'd like the lower half of the graph to show the red & the upper half
> of the graph to show the green, with a black line seperating the two. Any
> help appreciated!!!
> 
> test.dat
> 1 0.1
> 2 0.3
> 3 0.4
> 4 0.6
> 5 0.8
> 
> test.dat2
> 1 0.1
> 2 0.2
> 3 0.4
> 4 0.5
> 5 0.7
> 
> gnuplot.conf
> set terminal png
> set out "test.png"
> set xlabel "X-label"
> set ylabel "Y-label"
> plot "test.dat" u 1:2 w l, "test.dat2" u 1:2 w l
> 
> 

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Re: [Gnuplot-info] Factorial issue

[Philipp K. J. <ja...@ie...>]

On Monday 08 February 2010 07:53:24 am Tim Wojtulewicz wrote:
> On Mon, Feb 08, 2010 at 07:15:21AM -0800, Philipp K. Janert wrote:
> > On Sunday 07 February 2010 11:07:07 am Tim Wojtulewicz wrote:
> > > I'm working with a fairly complicated function, one part of which is
> > > the division of two factorials.  I'm having an issue with though,
> > > because gnuplot keeps returning NaN for what should be a simple
> > > division.  It will return NaN for something as simple as 100!/99!,
> > > which should just be 100. Is there a reason for this, or an easy way to
> > > fix it?  Thanks.
> >
> > The intermediate results overflow, despite the fact that
> > the final result is of meaningful size.
> >
> > Either work out the cancellations analytically, or work with
> > logarithms of all quantities (Stirlings approximation!), and
> > exponentiate at the end (if needed).
>
> So is this a version issue then?  The reply from Thomas seems like his
> is working correctly.  I'm working with version 4.2.5 on OS X 10.6.
> It's odd that his would work, and yet mine won't.

If anything, this is a platform issue. Quite frankly,
I was surprised that it worked for anybody. (It doesn't
for me.)

But this is besides the point: if you need factorials
of large numbers (>10), then you need to find ways
to tame overflow issues. Unless you are working in
infinite precision integer arithmetic, which is not 
something that gnuplot does.

>
> Tim
>
> ---------------------------------------------------------------------------
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Re: [Gnuplot-info] Factorial issue

[Tim W. <ti...@ie...>]

On Mon, Feb 08, 2010 at 07:15:21AM -0800, Philipp K. Janert wrote:
> On Sunday 07 February 2010 11:07:07 am Tim Wojtulewicz wrote:
> > I'm working with a fairly complicated function, one part of which is the
> > division of two factorials.  I'm having an issue with though, because
> > gnuplot keeps returning NaN for what should be a simple division.  It will
> > return NaN for something as simple as 100!/99!, which should just be 100. 
> > Is there a reason for this, or an easy way to fix it?  Thanks.
> 
> The intermediate results overflow, despite the fact that
> the final result is of meaningful size.
> 
> Either work out the cancellations analytically, or work with
> logarithms of all quantities (Stirlings approximation!), and
> exponentiate at the end (if needed).
> 

So is this a version issue then?  The reply from Thomas seems like his
is working correctly.  I'm working with version 4.2.5 on OS X 10.6.
It's odd that his would work, and yet mine won't.

Tim

Re: [Gnuplot-info] Factorial issue

[Philipp K. J. <ja...@ie...>]

On Sunday 07 February 2010 11:07:07 am Tim Wojtulewicz wrote:
> I'm working with a fairly complicated function, one part of which is the
> division of two factorials.  I'm having an issue with though, because
> gnuplot keeps returning NaN for what should be a simple division.  It will
> return NaN for something as simple as 100!/99!, which should just be 100. 
> Is there a reason for this, or an easy way to fix it?  Thanks.

The intermediate results overflow, despite the fact that
the final result is of meaningful size.

Either work out the cancellations analytically, or work with
logarithms of all quantities (Stirlings approximation!), and
exponentiate at the end (if needed).

>
> Tim
> ---------------------------------------------------------------------------
>--- The Planet: dedicated and managed hosting, cloud storage, colocation
> Stay online with enterprise data centers and the best network in the
> business Choose flexible plans and management services without long-term
> contracts Personal 24x7 support from experience hosting pros just a phone
> call away. http://p.sf.net/sfu/theplanet-com
> _______________________________________________
> gnuplot-info mailing list
> gnu...@li...
> https://lists.sourceforge.net/lists/listinfo/gnuplot-info

[Gnuplot-info] 2 graphs

[lozwell <lo...@ve...>]

I am looking for a way to plot two data files on top of each other. For
instance, basically two rectangles on top of each other, both with their own
y-axis but sharing the x-axis. Is this possible?

FOr example, the following has both red & green sharing the same space, but
I'd like the lower half of the graph to show the red & the upper half of the
graph to show the green, with a black line seperating the two. Any help
appreciated!!!

test.dat
1 0.1
2 0.3
3 0.4
4 0.6
5 0.8

test.dat2
1 0.1
2 0.2
3 0.4
4 0.5
5 0.7

gnuplot.conf
set terminal png
set out "test.png"
set xlabel "X-label"
set ylabel "Y-label"
plot "test.dat" u 1:2 w l, "test.dat2" u 1:2 w l

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Re: [Gnuplot-info] Factorial issue

[Thomas S. <t.s...@fz...>]

please provide a simple script, that shows the error.
which gnuplot version are you using, on which platform?

i can't reproduce the error here:

gnuplot> print 100!/99!
100.0


timwoj wrote:
> 
> I'm working with a fairly complicated function, one part of which is the
> division of two factorials.  I'm having an issue with though, because
> gnuplot keeps returning NaN for what should be a simple division.  It will
> return NaN for something as simple as 100!/99!, which should just be 100. 
> Is there a reason for this, or an easy way to fix it?  Thanks.
> 
> Tim
> ------------------------------------------------------------------------------
> The Planet: dedicated and managed hosting, cloud storage, colocation
> Stay online with enterprise data centers and the best network in the
> business
> Choose flexible plans and management services without long-term contracts
> Personal 24x7 support from experience hosting pros just a phone call away.
> http://p.sf.net/sfu/theplanet-com
> _______________________________________________
> gnuplot-info mailing list
> gnu...@li...
> https://lists.sourceforge.net/lists/listinfo/gnuplot-info
> 
> 

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[Gnuplot-info] Factorial issue

[Tim W. <ti...@ie...>]

I'm working with a fairly complicated function, one part of which is the division of two factorials.  I'm having an issue with though, because gnuplot keeps returning NaN for what should be a simple division.  It will return NaN for something as simple as 100!/99!, which should just be 100.  Is there a reason for this, or an easy way to fix it?  Thanks.

Tim

Re: [Gnuplot-info] 2 lines of data in one graph

[lozwell <lo...@ve...>]

Thanks!!!!



Thomas Sefzick wrote:
> 
> set y to a constant value:
> 
> splot "datafilename1" using 1:(1.0):2 , "datafilename2" using 1:(2.0):2 
> 
> 
> lozwell wrote:
>> 
>> I have two sets of data, each containing about 100,000 Y data points on
>> an X Time scale, and want to show both sets of data on one graph. The
>> problem I am having is that it is very hard to read both sets, as they
>> are pretty much on top of each other. I tried making one line width
>> greater than the other, but this distorts the data. I am sure I can use a
>> 3d graph somehow using splot, but I have no idea how to do this and
>> cannot find any good examples anywhere. Anyone have any ideas? Putting
>> the data in one file is also not a problem, such as 10:38:17 0.106 0.021.
>> 
>> example data file one
>> 10:38:17 0.106
>> 10:38:17 0.11
>> 10:38:17 0.154
>> 10:38:18 0.15
>> 10:38:18 0.119
>> 10:38:18 0.085
>> 10:38:19 0.04
>> 10:38:19 0.027
>> 10:38:29 0.021
>> 10:38:20 0.042
>> 
>> example data file 2
>> 10:38:17 0.021
>> 10:38:17 0.017
>> 10:38:17 0.048
>> 10:38:18 0.046
>> 10:38:18 0.035
>> 10:38:18 0.05
>> 10:38:19 0.02
>> 10:38:19 0.033
>> 10:38:19 0.022
>> 10:38:20 0.042
>> 
>> 
> 
> 

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Re: [Gnuplot-info] 2 lines of data in one graph

[Thomas S. <t.s...@fz...>]

set y to a constant value:

splot "datafilename1" using 1:(1.0):2 , "datafilename2" using 1:(2.0):2 


lozwell wrote:
> 
> I have two sets of data, each containing about 100,000 Y data points on an
> X Time scale, and want to show both sets of data on one graph. The problem
> I am having is that it is very hard to read both sets, as they are pretty
> much on top of each other. I tried making one line width greater than the
> other, but this distorts the data. I am sure I can use a 3d graph somehow
> using splot, but I have no idea how to do this and cannot find any good
> examples anywhere. Anyone have any ideas? Putting the data in one file is
> also not a problem, such as 10:38:17 0.106 0.021.
> 
> example data file one
> 10:38:17 0.106
> 10:38:17 0.11
> 10:38:17 0.154
> 10:38:18 0.15
> 10:38:18 0.119
> 10:38:18 0.085
> 10:38:19 0.04
> 10:38:19 0.027
> 10:38:29 0.021
> 10:38:20 0.042
> 
> example data file 2
> 10:38:17 0.021
> 10:38:17 0.017
> 10:38:17 0.048
> 10:38:18 0.046
> 10:38:18 0.035
> 10:38:18 0.05
> 10:38:19 0.02
> 10:38:19 0.033
> 10:38:19 0.022
> 10:38:20 0.042
> 
> 

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