gnuplot-info — For questions and discussion about gnuplot

Re: [Gnuplot-info] fitting a gaussian

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

On 10.06.2011 10:30, balaji nagarajan wrote:

> I have a doubt regarding , fitting a gaussian for a plot

> I have a x,y data, I have plotted it and I want to know the area of
> the plot ( it is a normal distribution) and the full width half
> maximum of the plot .

Neither of those have much relation to fitting a gaussian.  Area is just 
the sum of your data multiplied by a factor, and FWHM is exactly what it 
says.

Re: [Gnuplot-info] area_under_plot

[Tait <gnu...@t4...>]

> Dear GNU !

Gnuplot has nothing to do with GNU or the FSF. It's an
unfortunate coincidence of naming, as both names came into
being at about the same time, as far as I can tell. The "gnu"
in gnuplot comes a compromise between llamaplot and nplot. (See
http://www.gnuplot.info/faq/faq.html#SECTION00032000000000000000)

> I tried but i could not  understand !
>  it will be easy for me if there is any example !
> and my main aim is to calculate the area under the curve !

This is done by integration. You can determine the integral yourself by
hand, and have gnuplot evaluate it. Or you might be able to get gnuplot to
evaluate it numerically with some work, like what's done in the recursion
demo: http://gnuplot.sourceforge.net/demo_4.4/bivariat.html.

However, a better tool for that sort of job is either a programming
language to do numeric computation, or a computer algebra system to
handle symbolic manipulation. A plotting program like gnuplot is neither
of those things.

Octave (which _is_ a GPL program) uses gnuplot for plotting, and might
be able to do calculations like what you've requested. I'm not that
familiar with it. Or use a tool like Mathematica (pieces of which are
available through, e.g. http://integrals.wolfram.com), Maple, Sage
(http://www.sagemath.org), or even lower-level utilities like Python or
the GNU scientific library, if you're willing to learn to use them.

[Gnuplot-info] area_under_plot

[balaji n. <bal...@ho...>]

Dear GNU ! 

I tried but i could not  understand ! 
 it will be easy for me if there is any example ! 
and my main aim is to calculate the area under the curve ! 

is there any other way to do it ! 
 		 	   		  

Re: [Gnuplot-info] fitting a gaussian

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

define the gauss-function,

gauss(x)=amplitude/(sigma*sqrt(2.*pi))*exp(-(x-position)**2/(2.*sigma**2))

fit it to the data,

fit 'datafilename' gauss(x) via amplitude, position, sigma

and then plot it:

plot 'datafilename' with histeps, gauss(x)

and try to set 'amplitude', 'position', and 'sigma' to reasonable
values before fitting, otherwise the fit may get lost. 


crish wrote:
> 
> 
> 
> Dear GNU ! 
> 
> I have a doubt regarding , fitting a gaussian for a plot 
> 
> I have a x,y data, I have plotted it and I want to know the area of the
> plot ( it is a normal distribution) 
> and the full width half maximum of the plot . 
> 
> Is it possible to do it in GNU if so kindly  let me know ! 
> 
> regards 
> balaji
> 
> 
> 
>  		 	   		  
> ------------------------------------------------------------------------------
> EditLive Enterprise is the world's most technically advanced content
> authoring tool. Experience the power of Track Changes, Inline Image
> Editing and ensure content is compliant with Accessibility Checking.
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> gnuplot-info mailing list
> gnu...@li...
> https://lists.sourceforge.net/lists/listinfo/gnuplot-info
> 
> 

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Re: [Gnuplot-info] Selecting Font with Terminal "Postscript"

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

there is a typo in the fontfile option (should be "l" not "1")

filename of the font:
/usr/share/fonts/Type1/p052023l.pfb

your command:
gnuplot> set t postscript fontfile 'Type1/p0520231.pfb'


Rich Shepard wrote:
> 
> On Thu, 9 Jun 2011, Rich Shepard wrote:
> 
>>   According to "Gnuplot in Action" there's more detailed information on
>> using the postscript terminal in the application documents. Please point
>> me to the revelant doc.
> 
>    I should have added this information:
> 
> gnuplot> set t postscript enhanced
> Terminal type set to 'postscript'
> Options are 'eps enhanced defaultplex \
>     leveldefault monochrome colortext \
>     dashed dashlength 1.0 linewidth 1.0 butt \
>     palfuncparam 2000,0.003 \
>     "Palatino" 12 '
> 
> gnuplot> set fontpath '/usr/share/fonts'
> gnuplot> set t postscript fontfile 'Type1/p0520231.pfb'
> Terminal type set to 'postscript'
>                                     ^
>           Font file 'Type1/p0520231.pfb' not found
> 
> Rich
> 
> ------------------------------------------------------------------------------
> EditLive Enterprise is the world's most technically advanced content
> authoring tool. Experience the power of Track Changes, Inline Image
> Editing and ensure content is compliant with Accessibility Checking.
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> gnu...@li...
> https://lists.sourceforge.net/lists/listinfo/gnuplot-info
> 
> 

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[Gnuplot-info] fitting a gaussian

[balaji n. <bal...@ho...>]

Dear GNU ! 

I have a doubt regarding , fitting a gaussian for a plot 

I have a x,y data, I have plotted it and I want to know the area of the plot ( it is a normal distribution) 
and the full width half maximum of the plot . 

Is it possible to do it in GNU if so kindly  let me know ! 

regards 
balaji



 		 	   		  

Re: [Gnuplot-info] Selecting Font with Terminal "Postscript"

[Rich S. <rsh...@ap...>]

On Thu, 9 Jun 2011, Rich Shepard wrote:

>   According to "Gnuplot in Action" there's more detailed information on
> using the postscript terminal in the application documents. Please point
> me to the revelant doc.

   I should have added this information:

gnuplot> set t postscript enhanced
Terminal type set to 'postscript'
Options are 'eps enhanced defaultplex \
    leveldefault monochrome colortext \
    dashed dashlength 1.0 linewidth 1.0 butt \
    palfuncparam 2000,0.003 \
    "Palatino" 12 '

gnuplot> set fontpath '/usr/share/fonts'
gnuplot> set t postscript fontfile 'Type1/p0520231.pfb'
Terminal type set to 'postscript'
                                    ^
          Font file 'Type1/p0520231.pfb' not found

Rich

[Gnuplot-info] Selecting Font with Terminal "Postscript"

[Rich S. <rsh...@ap...>]

   In /usr/share/fonts/Type1/ I have

p052023l.pfb -urw-urw palladio l-medium-i-normal--0-0-0-0-p-0-adobe-standard

and I want to make this the default typeface for my plots. Because this is a
binary coded file I apparently need a helper application, but I cannot find
any information in /usr/doc/gnuplot-4.2.6/.

   According to "Gnuplot in Action" there's more detailed information on
using the postscript terminal in the application documents. Please point me
to the revelant doc.

Rich

Re: [Gnuplot-info] Disabling cross-isolines

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

On 08.06.2011 20:40, John Fattaruso wrote:

> (But I'm still seeing no mention of this behavior in the manual for
> version 4.4 I'm working with.)

I find that somewhat had to believe --- it's explained right there in 
both 'help datafile' and 'help index'.

Re: [Gnuplot-info] Disabling cross-isolines

[John F. <fat...@ie...>]

On 06/07/2011 11:37 PM, Tait wrote:
>>                    ... as in the attached GIF file.
>>           ... Am I missing some set parameter that will inhibit
>> cross-isolines, even with the same number of points in each data set?
>>
>> John
> 
> There was no attachment. The list software might have stripped it. Instead,
> you might post your script and data to plotshare.com.
> 
> To answer your question, you probably need to insert additional
> linebreaks. See "help datafile" or by way of an example,
> http://www.plotshare.com/index.ws/plot/814384616.
> 

OK, I've modified the Tcl script that generates the wave data to insert
two blank lines at each timepoint break instead of one, and that appears
to fix it. Now even with a constant number of data points at each time
step there are no cross isolines drawn. (But I'm still seeing no mention
of this behavior in the manual for version 4.4 I'm working with.) For
grins I've uploaded the working version to

http://www.plotshare.com/index.ws/plot/645350951

Thanks for the help-
John

Re: [Gnuplot-info] Disabling cross-isolines

[Tait <gnu...@t4...>]

>                    ... as in the attached GIF file.
>           ... Am I missing some set parameter that will inhibit
> cross-isolines, even with the same number of points in each data set?
>
> John

There was no attachment. The list software might have stripped it. Instead,
you might post your script and data to plotshare.com.

To answer your question, you probably need to insert additional
linebreaks. See "help datafile" or by way of an example,
http://www.plotshare.com/index.ws/plot/814384616.

[Gnuplot-info] Disabling cross-isolines

[John F. <fat...@ie...>]

I need to generate a 3-D plot in which one axis is time to depict a time
sequence of 2-D plots, as in the attached GIF file. It is intended to
demonstrate the superposition of two wave pulses, each propagating
toward and through each other, in a linear medium. The data points are
generated by an external Tcl script and written to a data file. I want
the points along the distance axis to be joined by lines, but I don't
want cross-isolines to be automatically generated that bridge the plots
to the adjacent time sequence. To generate the attached plot I put a
kludge in the Tcl code that slightly varies the number of points in the
distance direction computed at each time point, so as to break up the
automatic cross-isoline generation, but there seems like there should be
a better way. Am I missing some set parameter that will inhibit
cross-isolines, even with the same number of points in each data set?

John

Re: [Gnuplot-info] Adjusting Font and Label Position

[Rich S. <rsh...@ap...>]

On Tue, 7 Jun 2011, rhu...@ih... wrote:

> set t
> t = terminal not title

   Ah, missed that.

> Have you tried running your commands interactively? gnuplot version?

   Yes I have. Gnuplot-4.2.6.

Thanks,

Rich

Re: [Gnuplot-info] Adjusting Font and Label Position

[<rhu...@ih...>]

On Tue, 7 Jun 2011 15:14:32 -0700 (PDT)
Rich Shepard <rsh...@ap...> wrote:

> On Tue, 7 Jun 2011, Hans-Bernhard Bröker wrote:
> 
> > What you're still not getting is that gnuplot itself recognizes _no_ fonts
> > at all.  It's your output system (TeX, PostScript, freetype, cairo,
> > whatever) that does that.  So every driver will usually have a different
> > set of fonts.
> 
>    My copy of "Gnuplot in Action" arrived today. On page 206 (listing 11.3)
> is this example:
> 
> set t png font FreeSans 11
> set t png font "/usr/share/fonts/truetype/FreeSans.ttf, 11"
> 
>    In my script I tried both ways; for example,
> 
> set t "Daily Precipitation 2008-2010: CC-OR-8" font "/usr/share/fonts/TrueType/verdanab, 15"

set t

t = terminal not title

Have you tried running your commands interactively? gnuplot version?


> 
> yet when setting the terminal they both produce the same result:
> 
> gnuplot> set terminal jpeg
> Terminal type set to 'jpeg'
> Could not find/open font when opening font "arial", using internal
> non-scalable font
> Options are 'nocrop medium '
> 
>    BTW, I have the arial fonts installed in that same directory.
> 
>    What am I still missing?

Re: [Gnuplot-info] Adjusting Font and Label Position

[Rich S. <rsh...@ap...>]

On Tue, 7 Jun 2011, Hans-Bernhard Bröker wrote:

> What you're still not getting is that gnuplot itself recognizes _no_ fonts
> at all.  It's your output system (TeX, PostScript, freetype, cairo,
> whatever) that does that.  So every driver will usually have a different
> set of fonts.

   My copy of "Gnuplot in Action" arrived today. On page 206 (listing 11.3)
is this example:

set t png font FreeSans 11
set t png font "/usr/share/fonts/truetype/FreeSans.ttf, 11"

   In my script I tried both ways; for example,

set t "Daily Precipitation 2008-2010: CC-OR-8" font "/usr/share/fonts/TrueType/verdanab, 15"

yet when setting the terminal they both produce the same result:

gnuplot> set terminal jpeg
Terminal type set to 'jpeg'
Could not find/open font when opening font "arial", using internal
non-scalable font
Options are 'nocrop medium '

   BTW, I have the arial fonts installed in that same directory.

   What am I still missing?

Rich

Re: [Gnuplot-info] Adjusting Font and Label Position

[Rich S. <rsh...@ap...>]

On Tue, 7 Jun 2011, Rich Shepard wrote:

>   Is there documentation that tells me how to find what the terminals
> support on my linux system?

   In partial answer to my question: I set the terminal to postscript, then
to png and ran 'test' for each. The results are not what I expected.

   "test.ps" has no color at all; strictly black-and-white. "test.png" is
worse: it's rotated 90 degrees counterclockwise and filled with a gray
background. None of the sample text is visible.

   "test.jpg" shows full color and notes that it will rotate only truetype
fonts. So, I guess I get a TT font name it recognizes and output to .jpg
rather than to .png.

Rich

Re: [Gnuplot-info] Adjusting Font and Label Position

[Rich S. <rsh...@ap...>]

On Tue, 7 Jun 2011, Hans-Bernhard Bröker wrote:

> What you're still not getting is that gnuplot itself recognizes _no_ fonts
> at all.  It's your output system (TeX, PostScript, freetype, cairo,
> whatever) that does that.  So every driver will usually have a different
> set of fonts.

   Actually, I got that a while ago. What I don't know is how to identify the
typefaces available to me under the different terminal types supported by
gnuplot. I care less how it looks on the x11 terminal than what it looks
like when exported to .png or .ps.

   Is there documentation that tells me how to find what the terminals
support on my linux system?

Thanks,

Rich

Re: [Gnuplot-info] Adjusting Font and Label Position

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

On 07.06.2011 01:33, Rich Shepard wrote:

>     Strange. That doesn't work, either. If I specify "Times" it works. Except,
> when I go to export the grphic and 'set terminal png' there's an error
> message that gp cannot find "Arial" (probably because I don't have that
> installed) and it defaults to some non-scalable typeface.

You're silently assuming that font selection must somehow be the same 
for all terminals.  It's not.

>     I have quite a few Type1, TrueType, and Bitstream fonts installed here.

The problem with that idea is that you assume that there is a single, 
well-defined meaning to "installing" a font.  There isn't.

> I'm sure there's a name that gp will recognize

What you're still not getting is that gnuplot itself recognizes _no_ 
fonts at all.  It's your output system (TeX, PostScript, freetype, 
cairo, whatever) that does that.  So every driver will usually have a 
different set of fonts.

Re: [Gnuplot-info] Adjusting Font and Label Position

[Rich S. <rsh...@ap...>]

On Tue, 7 Jun 2011, Hans-Bernhard Bröker wrote:

> For the case at hand, I'd suggest adjusting the capitalization:
>
> 	"Palatino"

   Strange. That doesn't work, either. If I specify "Times" it works. Except,
when I go to export the grphic and 'set terminal png' there's an error
message that gp cannot find "Arial" (probably because I don't have that
installed) and it defaults to some non-scalable typeface.

   I have quite a few Type1, TrueType, and Bitstream fonts installed here.
I'm sure there's a name that gp will recognize and accept if I can find the
time to go through all of 'em.

Rich

Re: [Gnuplot-info] Adjusting Font and Label Position

[Rich S. <rsh...@ap...>]

On Tue, 7 Jun 2011, Hans-Bernhard Bröker wrote:

> Seems you missed the meaning of the text in "help set xlabel" about the
> actual contents of the <offset> argument.  Note how it speaks of 'x,y'? 
> What you were looking for is
>
> 	set xlabel 'my text' offset 0, -5

   Yes, you are correct.

> And what does that actually end up in the generated PostScript file?

   Blank space with error messages in the virtual terminal that the font
cannot be found.

> I'd suggest adjusting the capitalization:
>
> 	"Palatino"

   Makes sense. I'll try that.

Thank you again,

Rich

Re: [Gnuplot-info] Adjusting Font and Label Position

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

On 06.06.2011 23:53, Rich Shepard wrote:
> On Mon, 6 Jun 2011, Hans-Bernhard Bröker wrote:

> I don't know if it qualifies as 'exhaustive' but I tried -0.5, -1. -5, and
> -3 as offsets.

Seems you missed the meaning of the text in "help set xlabel" about the 
actual contents of the <offset> argument.  Note how it speaks of 'x,y'? 
  What you were looking for is

	set xlabel 'my text' offset 0, -5

>> Sure "palatin_e_" isn't a typo? I just ask because the other two times
>> you wrote "palatin_o_"?

> Yep. It's a typo. And, apparently, palatino is not recognized as a
> typeface. It's what I use in LaTeX/LyX.

And what does that actually end up in the generated PostScript file? 
Note that LaTeX has an entire world of font specification methods all 
its own.  None of that automatically works for gnuplot, which follows a 
pretty simple scheme: you give it a string, and it'll put that into the 
outputfile.  For the case at hand, I'd suggest adjusting the capitalization:

	"Palatino"



>> As to that list of supported font --- there isn't one, and there
>> really can't be. gnuplot doesn't "support" PostScript fonts. It just
>> passes what you told it into the PostScript file. The instance that
>> needs to support those fonts is your PostScript interpreter.
>
> Well, ghostscript seems to have no issues with palatino in other
> applications. Where do you suggest I look to learn what typefaces will work
> locally with gnuplot?
>
>> -1 is not a line color. It's a linetype. On some terminal drivers, that
>> linetype will end up black. If you don't like that, or want some other
>> linetype in black, use the 'linecolor' option.
>
> Fixed.
>
> Sample plot attached.
>
> Thanks,
>
> Rich
>
>
>
> ------------------------------------------------------------------------------
> EditLive Enterprise is the world's most technically advanced content
> authoring tool. Experience the power of Track Changes, Inline Image
> Editing and ensure content is compliant with Accessibility Checking.
> http://p.sf.net/sfu/ephox-dev2dev
>
>
>
> _______________________________________________
> gnuplot-info mailing list
> gnu...@li...
> https://lists.sourceforge.net/lists/listinfo/gnuplot-info

Re: [Gnuplot-info] Adjusting Font and Label Position

[Rich S. <rsh...@ap...>]

On Mon, 6 Jun 2011, Hans-Bernhard Bröker wrote:

> Did you exhaustively try out the 'offset' option to 'set xlabel'?  And
> what you mean by down "from" the xtic labels?

Hans-Bernhard,

   I don't know if it qualifies as 'exhaustive' but I tried -0.5, -1. -5, and
-3 as offsets. What I mean by down from the xtic labels is lower than the
label text itself (dates, rotated 90 degrees).

> Sure "palatin_e_" isn't a typo?  I just ask because the other two times you 
> wrote "palatin_o_"?

   Yep. It's a typo. And, apparently, palatino is not recognized as a
typeface. It's what I use in LaTeX/LyX.

> As to that list of supported font --- there isn't one, and there really can't 
> be.  gnuplot doesn't "support" PostScript fonts.  It just passes what you 
> told it into the PostScript file.  The instance that needs to support those 
> fonts is your PostScript interpreter.

   Well, ghostscript seems to have no issues with palatino in other
applications. Where do you suggest I look to learn what typefaces will work
locally with gnuplot?

> -1 is not a line color.  It's a linetype.  On some terminal drivers, that
> linetype will end up black.  If you don't like that, or want some other
> linetype in black, use the 'linecolor' option.

   Fixed.

   Sample plot attached.

Thanks,

Rich

Re: [Gnuplot-info] Adjusting Font and Label Position

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

On 06.06.2011 18:28, Rich Shepard wrote:
> set xlabel "Date" font "palatine,11" offset -3

>
>     1. I cannot move the xlabel down from the rotated xtic labels

Did you exhaustively try out the 'offset' option to 'set xlabel'?  And 
what you mean by down "from" the xtic labels?

>     2. The typeface does not change to palatine (and I cannot find a list of
>   	the PostScript typefaces supported by gnuplot).

Sure "palatin_e_" isn't a typo?  I just ask because the other two times 
you wrote "palatin_o_"?

As to that list of supported font --- there isn't one, and there really 
can't be.  gnuplot doesn't "support" PostScript fonts.  It just passes 
what you told it into the PostScript file.  The instance that needs to 
support those fonts is your PostScript interpreter.

>     3. I've not seen where to specify a line color of -1 (black) for the
>   	boxes.

-1 is not a line color.  It's a linetype.  On some terminal drivers, 
that linetype will end up black.  If you don't like that, or want some 
other linetype in black, use the 'linecolor' option.

Re: [Gnuplot-info] sqrt symbol for sqrt(x+3) and sqrt(x)+3

[Tom S. <tsm...@gm...>]

On Mon, Jun 6, 2011 at 1:52 AM, Thomas Sefzick <t.s...@fz...>wrote:

>
> it's better to position the bar first and then the other stuff, otherwise
> characters may overlap.
>
> doesn't look good:
> set title '{/Symbol @\326\140}@m{/Symbol \140}@+{/Symbol \140}3'
>
> looks much better:
> set title '{/Symbol @{\140\140\140\140}\326}m+3
>
>
It works. Thanks so much.

Tom

[Gnuplot-info] Adjusting Font and Label Position

[Rich S. <rsh...@ap...>]

   Despite reading on-line and other documentation I'm not getting the
appearance as I want. Here is the script:

---
set datafile missing "NA"
set xdata time
set timefmt "%Y-%m-%d"
set format x "%d-%m-%Y"
set nokey
set xtics rotate font "palatino,11"
set xlabel "Date" font "palatine,11" offset -3
set ylabel "Precipitation (in)" font "palatino,13"
set title "Daily Precipitation 2008-2010: CC-OR-8"
set size ratio -2

plot "cocorahs.dat" u 1:($2) w boxes
---

   Three issues I've not resolved:

   1. I cannot move the xlabel down from the rotated xtic labels

   2. The typeface does not change to palatine (and I cannot find a list of
 	the PostScript typefaces supported by gnuplot).

   3. I've not seen where to specify a line color of -1 (black) for the
 	boxes.

   Pointers appreciated.

Rich