gnuplot-info — For questions and discussion about gnuplot

Re: [Gnuplot-info] Ebhanced terminal type with Multiplot error

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

Suman Dhayal wrote:

> But right now, I am need to combine two plots
> together whose x-coordinate scale factor is the same but not the
> y-coordinate. I used the multiplot command to do this 

Multiplot is almost never the right technique for that kind of job. 
Secondary y axes would be a lot easier to use.

> and since I needed to change the font also for some labels and
> titles, I used the enhanced terminal type.

Nitpick: "enhanced" is not a terminal type.  It's a common terminal 
option.  What actually was your terminal type?

> not use the terminal type "enhanced", the "~" label works but when I
> use it along with this terminal,

Read "help enhanced" again, slowly.  Find the '~' and learn what you 
just did, and how not to do it.

[Gnuplot-info] Ebhanced terminal type with Multiplot error

[Suman D. <su...@ph...>]

hi,

This is Suman from Univ of Miami .. I have been Gnuplot since 2 years now.
It's just great to use. But right now, I am need to combine two plots
together whose x-coordinate scale factor is the same but not the
y-coordinate. I used the multiplot command to do this and since I needed to
change the font also for some labels and titles, I used the enhanced
terminal type. Now I want to put a label as "~" at the end points of the two
figures separating y-scales(or we can say between the two figures on the
y-axis) to show the change of scale but I am not able to do so. When I do
not use the terminal type "enhanced", the "~" label works but when I use it
along with this terminal, I don't see my figures at all except the lower
figures bounding box and the x and y scales .. I believe there is some font
problem probably but I do not know what exactly it it. So please can you
help me in this?? I will be very thankful to you.

Suman
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Re: [Gnuplot-info] Option reverse and table

[Loïc <xl...@fr...>]

Many thanks, I didn't think at a parametric curve.

Loïc

Le mercredi 23 juillet 2008 à 00:15 +0200, Hans-Bernhard Bröker a
écrit :
> Loïc wrote:
> 
> > set table "out" 
> > set xrange [0:10] reverse
> > plot x**2
> 
> [...]
> 
> > Hence, x are in increasing mode, and not decreasing as I wish.
> > 
> > Is it a bug ? 
> 
> No.  There's no promise of the range reversal affecting sampling order. 
>   It affects the relation between coordinates and positions on a graph, 
> not the order in which those positions are visited.  That ordering is 
> generally unimportant, since you couldn't spot the difference in the 
> resulting image anyway.
> 
> The table driver makes that a bit mor complicated, of course.  But, like 
> with so many problems, parametric mode helps:
> 
> gnuplot> set table ; set parametric ; set samples 15
> gnuplot> f_x(t) = 10 - t
> gnuplot> plot [0:10] f_x(t), f_x(t)**2
> 
> #Curve 0 of 1, 15 points
> #x y type
>   10  100  i
>   9.28571  86.2245  i
>   8.57143  73.4694  i
>   7.85714  61.7347  i
>   7.14286  51.0204  i
>   6.42857  41.3265  i
>   5.71429  32.6531  i
>   5  25  i
>   4.28571  18.3673  i
>   3.57143  12.7551  i
>   2.85714  8.16327  i
>   2.14286  4.59184  i
>   1.42857  2.04082  i
>   0.714286  0.510204  i
>   0  0  i
> 
> 

[Gnuplot-info] Plottin 3D with one column

[Bryan L. <bry...@ya...>]

I was thinking of creating a 3D surface with 9 regions that will be based on
just one column. So, 1 entry in the column will correspond to 1 region on
the surface wherein the intensity/amplitude/level will depend on the given
value. I hope you guys could help me out

Thanks,
Bryan 
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Re: [Gnuplot-info] Option reverse and table

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

Loïc wrote:

> set table "out" 
> set xrange [0:10] reverse
> plot x**2

[...]

> Hence, x are in increasing mode, and not decreasing as I wish.
> 
> Is it a bug ? 

No.  There's no promise of the range reversal affecting sampling order. 
  It affects the relation between coordinates and positions on a graph, 
not the order in which those positions are visited.  That ordering is 
generally unimportant, since you couldn't spot the difference in the 
resulting image anyway.

The table driver makes that a bit mor complicated, of course.  But, like 
with so many problems, parametric mode helps:

gnuplot> set table ; set parametric ; set samples 15
gnuplot> f_x(t) = 10 - t
gnuplot> plot [0:10] f_x(t), f_x(t)**2

#Curve 0 of 1, 15 points
#x y type
  10  100  i
  9.28571  86.2245  i
  8.57143  73.4694  i
  7.85714  61.7347  i
  7.14286  51.0204  i
  6.42857  41.3265  i
  5.71429  32.6531  i
  5  25  i
  4.28571  18.3673  i
  3.57143  12.7551  i
  2.85714  8.16327  i
  2.14286  4.59184  i
  1.42857  2.04082  i
  0.714286  0.510204  i
  0  0  i

[Gnuplot-info] Option reverse and table

[Loïc <xl...@fr...>]

Hello everyone

I have to use table terminal mode to recover the coordinates from a
plotted function with decreasing X.

Example: I want to plot the function f(x)=x^2 between 0 and 10
I want the coordinates from x=10 to x=0

------------------------------------
The commands I wrote:

set table "out" 
set xrange [0:10] reverse
plot x**2
------------------------

Then I edit the file called "out"
but the first lines are:

 0  0  i
 0.10101  0.010203  i
 0.20202  0.0408122  i
 0.30303  0.0918274  i
 0.40404  0.163249  i
 0.505051  0.255076  i
 0.606061  0.367309  i
 0.707071  0.499949  i
 0.808081  0.652995  i
 0.909091  0.826446  i
 1.0101  1.0203  i
..............
Hence, x are in increasing mode, and not decreasing as I wish.

Is it a bug ? If it isn't, how can I release what I want?
Thanks in advance

Best regards

Loïc

Re: [Gnuplot-info] heatmap + ternary operator problem

[atoms.h <l....@fr...>]

Thanks, after some further research I came to the same conclusion...

> set pal mod RGB funct (gray>1./400.?sqrt(gray):1),
> (gray>1./400.?gray**3:1), (gray>1./400.?sin(gray*2.*pi):1)

This is quite fancy! Amazing...
by now I changed the coloring to a simple gradient:
white,purple,blue,cyan,green,yellow,red
Which also works - if not as sophisticated...

Many thanks,
Thomas
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Re: [Gnuplot-info] heatmap + ternary operator problem

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

> ...
> $ splot "radET1.hdat" u 1:2:( $4==0 ? 1/0 : 4 ) w image
>
> would do the trick, but doesn't. It always gives errors like
> "GNUPLOT (plot_image):  Image grid must be at least 2 x 2" or
> "GNUPLOT (plot_image):  Visible pixel grid has a scan line shorter than
> previous scan lines"

'help image' says:
> ... It is assumed that the image data forms an
> equidistant sampling grid in the viewing plane along two
> ... directions.

for each grid point a value is required, so exclusion is not possible.

> Mabe it isn't even possible to exclude points from grid data like this?
> Any clues??

make the unwanted points white:

set pal mod RGB funct (gray>1./400.?sqrt(gray):1), (gray>1./400.?gray**3:1),
(gray>1./400.?sin(gray*2.*pi):1)

(you may replace 1./400. by some value smaller than your valid data)
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[Gnuplot-info] heatmap + ternary operator problem

[atoms.h <l....@fr...>]

Maybe I don't understand the syntax right, but in priciple I get the plot to
work when I do

$ set view map
$ set xrange [60:200]
$ set yrange [0:300]
$ set cbrange [0:200]
$ splot "radET1.hdat" u 1:2:4 w image

This gives me a projection of my data to the xy-plane. Now, what I like to
do is to exclude points in column 4 which are zero, since in my plot they
have no physical meaning and should not be included in the pm3d coloring.
Therefore I thought something like

$ splot "radET1.hdat" u 1:2:( $4==0 ? 1/0 : 4 ) w image

would do the trick, but doesn't. It always gives errors like
"GNUPLOT (plot_image):  Image grid must be at least 2 x 2" or
"GNUPLOT (plot_image):  Visible pixel grid has a scan line shorter than
previous scan lines"

Mabe it isn't even possible to exclude points from grid data like this? Any
clues??
(For now I shifted the cbrange sightly to negative values)
 Thanks in advance,
Thomas
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Re: [Gnuplot-info] eps - cuts down the x-label

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

> Many thanks, Thomas, this works! I reset the bounding box
> with pico. Is it possible to make it via gnuplot? Or is it better
> to write a little script to change the bounding boxes in all of
> my figures? I have a lot. :-) And I've never did such a thing. . .

you don't need to (i just found out how it works):
there is the 'noenhanced' option for 'set xlabel' (and other labels)
which switches the enhanced mode off for this label.
it's useful for labels which contain no special 'enhanced' sequences.

just append 'noenhanced' to your 'set xlabel' command and the xlabel
will appear at the same position as it would appear in 'noenhanced'
mode.
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Re: [Gnuplot-info] eps - cuts down the x-label

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

> ...
> set term post color enhanced 

it's the 'enhanced' option which positions the xlabel at a slightly
different position than 'noenhanced' mode does.
the bounding box should be adjusted differently in 'enhanced' mode,
but it isn't.

you could adjust (with a simple text editor) the bounding box from
%%BoundingBox: 50 50 410 302
to
%%BoundingBox: 50 48 410 302
in the eps-file to get the complete xlabel shown.

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Re: [Gnuplot-info] eps - cuts down the x-label

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

> I tried out many methods to avoid this problem, but I failed.
> When I draw an eps file via gnuplot with an x label in the figure,
> it always cuts down the bottom of the letters that are in the label.
> For example, if I write into the scripit: set xlabel "gravity" . . .
> it will cut down the bottom of g and y. Does anyone has a
> suggestion to avoid this?

could you send a sample script which produces this behavior?

and, which version of gnuplot are you using?

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Re: [Gnuplot-info] Gnuplot updating graphs in real time

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

> How can I set the label to display in the same position, i.e. Top
> of graph if the graph starts with y values from 0 to 2, but later a
> value pops in to say 50?  If i set it using coordinates, then the
> whole scale changes, the position of the labels change.  Basically
> I'd like to create a fixed label...

'help set label' gives an answer:
> ...
> The <position> is specified by either x,y or x,y,z, and may be preceded by
> `first`, `second`, `graph`, `screen`, or `character` to select the
> coordinate
> system.  See `coordinates` for details.

and 'help coordinates' tells you:
> ...
> `graph` specifies the area within the axes---0,0 is bottom
> left and 1,1 is top right

set label 1 "abc" at graph 0.5,0.95 center

will place your label centered in the middle of the x axis just below the
upper y axis.

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Re: [Gnuplot-info] Gnuplot updating graphs in real time

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

> I can get that to work too, but unfortunately as soon as the data
> is updated the numbers garble up as they aren't clearing the
> previous numbers, but are overwriting them.
> I am doing this by passing the variable for total packets to the
> label paramter in gnuplot...

a 'show label' will tell you that you have defined a whole bunch of labels,
because each 'set label' creates a new label.
but - each label has also a tag (see 'help label')!

so, modifying your script so that your labels have defined tags
will result in modified labels:

set label 1 'Packet Count: $total_packets' at 1,1;
set label 2 'Total Retransmits: $total_retrans' at 1,1.5;

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Re: [Gnuplot-info] [Gnuplot-bugs] ls and path

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

Kolmakov, German V wrote:

> My proposition is to include the "ls" command into the list of gnuplot standard command,
> like "pwd" or "cd", for example. It would save a little time for users because they could omit "!"))).

But unlike pwd and cd, which are needed for gnuplot's own operation (the 
current directory directory directly affects file lookup), 'ls' doesn't 
do anything for gnuplot.  It would therefore go directly against the 
Unix tool philosophy of "one tool <-> one task".  Because of this, I'm 
opposed to this change.

> Also, can I assign the path to search command files in gnuplot?

See "help loadpath".

[Gnuplot-info] win32 build of wxt terminal?

[Gary S. <g.a...@tu...>]

Hello all,

I was wondering if there are any win32 builds of gnuplot that include 
wxt terminal support?

I've tried the latest binary snapshots of 4.3. Is the wxt terminal 
supported in win32 builds?

Thanks,
Gary.

[Gnuplot-info] Projection

[atoms.h <l....@fr...>]

I would like to know if it is possible, to do a 2D projection of 3D diagram
in a 2D plot.

By now I only was able to do a 3D plot, unset the surface and rotate the
view so it looks like a 2D projection...

kind regards
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Re: [Gnuplot-info] Fitting

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

atoms.h wrote:
> Is it possible to contrain a fit parameter?
> For example a>0 or a=2..3?

You can use a function of your choice to map the fitted parameter to the 
one used in the function, e.g.

	a(a_fit) = exp(a_fit)
	# or
	# a(a_fit) = 2+tanh(a_fit)/2

	fit f(x,a(a_fit)) 'data' via a_fit

[Gnuplot-info] Fitting

[atoms.h <l....@fr...>]

Is it possible to contrain a fit parameter?
For example a>0 or a=2..3?

kind regards
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Re: [Gnuplot-info] UTF-8 encoding

[Dieter J. <die...@t-...>]

Dear Robert,
you have to use gnuplot 4.3 from CVS in order to make this work (if there is a 
precompiled M$-binary, what I do not know).
The only other alternative for now is opensuse 11.0 because the version of 
gnuplot that is shipped with it has been patched to work as you'd expect it 
to.
Hope this helps
take care




Dieter Jurzitza

-- 
-----------------------------------------------------------

                               |
                                \
                 /\_/\           |
                | ~x~ |/-----\   /
                 \   /-       \_/
  ^^__   _        /  _  ____   /
 <°°__ \- \_/     |  |/    |  |
  ||  ||         _| _|    _| _|

if you really want to see the pictures above - use some font
with constant spacing like courier! :-)
-----------------------------------------------------------Am Mittwoch, 2. 
Juli 2008 12:43:34 schrieb Robert Schikowski:
> Hi all,
>
> I'm using gnuplot 4.2 on Windows XP. What I want to do is to plot from a
> file containing IPA symbols encoded in UTF-8. However, if I do
>
>    set terminal png font arialuni
>    plot 'file' using 2:3:1 with labels
>
> the correct font is used, but the UTF-8 file seems to be interpreted as
> ISO- Latin-1 or whatever the default setting is (e.g. inverted e's turn to
> an accented E). I tried to do
>
>    set encoding utf8
>
> but I was told by the terminal that it was
>
>    expecting one of 'default', 'iso_8859_1', 'iso_8859_2', 'iso_8859_15',
>    'cp437', 'cp850', 'cp852', 'koi8r', 'koi8u'
>
> Is there any way to add UTF-8? Or any other way to get my IPA symbols onto
> the plot?
>
> Robert
>
>
> -------------------------------------------------------------------------
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[Gnuplot-info] UTF-8 encoding

[Robert S. <mat...@gm...>]

Hi all,

I'm using gnuplot 4.2 on Windows XP. What I want to do is to plot from a file 
containing IPA symbols encoded in UTF-8. However, if I do 

   set terminal png font arialuni
   plot 'file' using 2:3:1 with labels

the correct font is used, but the UTF-8 file seems to be interpreted as ISO-
Latin-1 or whatever the default setting is (e.g. inverted e's turn to an 
accented E). I tried to do

   set encoding utf8

but I was told by the terminal that it was

   expecting one of 'default', 'iso_8859_1', 'iso_8859_2', 'iso_8859_15', 
   'cp437', 'cp850', 'cp852', 'koi8r', 'koi8u'

Is there any way to add UTF-8? Or any other way to get my IPA symbols onto the 
plot?

Robert

Re: [Gnuplot-info] Command line way to prevent unbuffered?

[Jim K. <je...@kl...>]

Ethan Merritt wrote:
> On Monday 10 January 2005 10:46 pm, Ethan Merritt wrote:
>>> diff -u -r1.72 plot.c
>>> --- plot.c    25 Aug 2004 22:33:16 -0000    1.72
>>> +++ plot.c    11 Jan 2005 05:26:21 -0000
>>> @@ -422,7 +422,9 @@
>>>       * Do any non-X platforms suffer from the same problem?
>>>       * EAM - Jan 2004.
>>>       */
>>> -    setvbuf(stdin, (char *) NULL, _IONBF, 0);
>>> +    if (isatty(fileno(stdin))) {
>>> +        setvbuf(stdin, (char *) NULL, _IONBF, 0);
>>> +    }
>>>  #endif
>>
>> I see why you want this.  But speed is no good if the program
>> does not function properly, and previous experience showed that
>> unbuffering the input stream was needed for at least some 
>> implementations of piped input.
> 
> I have changed my mind.  The behavior is not likely to differ
> from user to user, only from one platform to another. So it should
> be a configuration option for building on that platform, not a
> run-time option on the command line.
> 
> How about we wrap the code as follows:
> 
> #ifndef UNBUFFERED_STDIN
>     setvbuf(stdin, (char *) NULL, _IONBF, 0);
> #endif
> 
> and you can provide a brief set of instructions for how to set
> this conditional compilation flag during the cygwin configuration setup.
> I have not used cygwin, so I don't know exactly how that is done.
> 
> It would be nice if you also checked that this doesn't interfere
> with correct execution of "pause" commands, however, since as I
> recall that was one of the original problems this was supposed to fix.
> For instance, please check that "mousevariables.dem" works properly with 
> buffered input under cygwin. 
> 



The attached patch achieves the speedup and works
properly with mousevariables.dem.

The use of __CYGWIN__ makes it specific to that platform.

I suspect this would also help other platforms.

Please consider for upstream inclusion.

Thanks - Jim

[Gnuplot-info] 2 dimensional plot of Yield surface in Deviatoric Plane

[Shahed R. <sha...@ya...>]

Hi All,
I want to draw two dimensional plot of Yield Surface in Deviatoric Plane or pi plane.It is easier to plot in 2 dimensional plane by Excel easily.But facing problem to draw in deviatoric plane.
 
Any idea will be appreciatable.
 
Regards,
Rana


      

Re: [Gnuplot-info] 4d Plotting

[H. G. A. <as...@gm...>]

On Sun, Jun 22, 2008 at 20:51, nstamato <nst...@gm...> wrote:
>
> Hi,
Hi!
>
> I am trying to make an essentially 4d plot with gnuplot. I have a file in
> the form
>
> x y z t
> . . . .
> . . . .
> . . . .
>
> and I want to make a plot where point (x,y,z) gets a color depending on the
> value of t. Anyone knows how to do that?
>

gnuplot> splot 'file.dat' u 1:2:3:4 w p lt palette

see help splot and help palette for additional help.

> thanks
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>
>
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---------------------------------------------
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[Gnuplot-info] 4d Plotting

[nstamato <nst...@gm...>]

Hi,

I am trying to make an essentially 4d plot with gnuplot. I have a file in
the form

x y z t
. . . .
. . . . 
. . . . 

and I want to make a plot where point (x,y,z) gets a color depending on the
value of t. Anyone knows how to do that?

thanks
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