gnuplot-info — For questions and discussion about gnuplot

Re: [Gnuplot-info] Internal variables

[Hans-Bernhard B. <br...@ph...>]

swlab wrote:
> On Wednesday 19 January 2005 08:37, Hans-Bernhard Broeker wrote:

> OK, that's what I feared. The problem is that if I use predefined values for 
> the range I lose gnuplot's capacity to define what the best range is

Yes.  But that's inavoidable anyway, to at least some extent --- the 
"best range" found by gnuplot doesn't live long enough to be exported 
like that (well, setting aside the 'writeback' feature, that is...)

[...]

> OK, one particular example should make it easier to understand.
> In a postscript term , I stack 3 plots vertically, same x size, different y 
> sizes. The y axis title of the 1st plot is in Times 16, the two others in 
> Times 12 (same for the tics). 

There's your problem.  Keep the font sizes the same, and you could align 
them.  If you don't, there's nothing left gnuplot can do for you, since 
the positioning offsets for axis labels are expressed in multiples of 
the font height / width (or rather: of what gnuplot believes those to be).

Re: [Gnuplot-info] Internal variables

[swlab <sw...@co...>]

On Wednesday 19 January 2005 08:37, Hans-Bernhard Broeker wrote:

> If you want to access those variables, I'm afraid the only sensible way
> is to do it the other way round: invent your own variable names for
> these, and issue commands to set the gnuplot state according to them, i.e.

> 	set xrange [my_xleft:my_xright]

OK, that's what I feared. The problem is that if I use predefined values for 
the range I lose gnuplot's capacity to define what the best range is (and 
frankly, I'm not keen writing some code that would badly replicate that....)
So: new feature ? 

> > Another application I have in mind is to align axes labels in a multiplot
> > graph:
>
> Align them --- to _what_?  Have you read and understood 'help coordinates'?

OK, one particular example should make it easier to understand.
In a postscript term , I stack 3 plots vertically, same x size, different y 
sizes. The y axis title of the 1st plot is in Times 16, the two others in 
Times 12 (same for the tics). I align my 3 axes with lmargin. I want the axes 
titles to be aligned one with the other (ie, same vertical baseline). 
I can fiddle around with the x,y values in ylabel to get the title of plot #2 
to bw aligned with plot #1, by trial and error. It's long, and not 
reproducible. So, I wondered at what distance from the y axis are the labels 
positioned by default (OK, I guess it depends on the terminal, on the font 
size....) ? Is there a better way to write axes titles on the page/screen ?

Re: [Gnuplot-info] read a single value from another datafile

[Hans-Bernhard B. <br...@ph...>]

Peter Bossy wrote:

> I'm not sure if there is a solution for this problem:
> I want to read a single value from another datafile than the plotted 
> file, and store the value in a variable for calculations while 
> plotting.

No way from inside gnuplot, I suspect (well, except maybe some seriously 
ugly hack involving a 'fit' of that data file...).  The usual way would 
be to assume piping capabilities, and let external tools do the job, i.e.:

	myvar = `program_to_extract_value_from -option filename`

Note that those are back-quotes ``, not ordinary '' ones.

[Gnuplot-info] read a single value from another datafile

[Peter B. <p....@vo...>]

Hi.

I'm not sure if there is a solution for this problem:
I want to read a single value from another datafile than the plotted 
file, and store the value in a variable for calculations while 
plotting.
The second datafile contains also columns of datas. So I have to 
specify the position of the value (field) where to read from.

e.g.
myvar = 'this_value_has_to_be_read_from_a_special_position_of_a_file'

plot 'datafile' using (($1-myvar)/86400):($3/$2*100)


Any ideas?
Thank you

Greetings from Germany

Peter

Re: [Gnuplot-info] Internal variables

[Hans-Bernhard B. <br...@ph...>]

swlab wrote:

> I'm writing some templates, and I'd like to access some of the plot internal 
> variables (eg, maximum and minimum of x values, as determined by an autoplot; 
> R2 of a fit; automatic label offset ...). 

That would be seriously difficult, given that for at least some plots, 
these values don't even exist other than during the execution of a 
'plot' or 'splot' command.

If you want to access those variables, I'm afraid the only sensible way 
is to do it the other way round: invent your own variable names for 
these, and issue commands to set the gnuplot state according to them, i.e.

	set xrange [my_xleft:my_xright]

> Another application I have in mind is to align axes labels in a multiplot 
> graph: 

Align them --- to _what_?  Have you read and understood 'help coordinates'?

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[Gnuplot-info] Question

[Tia G. <ti...@ho...>]

Hey,
I am working on using gnuplot in a source code I am modifying. However, in 
your documentation I couldn't find anything, which said how to pass an array 
of pointers into gnuplot. For example: I want to pass int *hist[..]; into 
gnuplot so as to plot a graph using the address of each cell (0,1,2,3....) 
as the x-axis and the value contained in each as the y-axis. Should I stream 
the array into a text/binary file and then use the program?
I would appreciate your help,
Thanks
-Tia.

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[Gnuplot-info] Internal variables

[swlab <sw...@co...>]

Hello,

I'm writing some templates, and I'd like to access some of the plot internal 
variables (eg, maximum and minimum of x values, as determined by an autoplot; 
R2 of a fit; automatic label offset ...). 
For example, in Gri, the maximum x value is stored in the internal 
variable .xright. (or eqvlt, I haven't checked), and it's pretty easy to use 
this value in some labels.
Another application I have in mind is to align axes labels in a multiplot 
graph: aligning the axes is obvious, but I have to rely on trial/error to get 
axes labels on the same baseline

Could anybody point me to some resources ?
Thx in advance
P.

Re: [Gnuplot-info] REQ: Help with formatting the print-output ofgnuplot

[Franco F. <ffr...@Ca...>]

In gnuplot 4.1 you can do the following  to get print formating:

print sprintf("value: %.2f",VALUE)

This requires that gnuplot is compiled with the following experimental
option: 

 #define GP_STRING_VARS 2 



>>> Hans-Bernhard Broeker <br...@ph...> 17-1-05
15:22:48 >>>
David Rabanus wrote:

> print "Value: %.2f",VALUE

[...]
> Any idea how to set that in gnuplot*

You don't.  'set label' has this behaviour, but not 'print'.



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Re: [Gnuplot-info] REQ: Help with formatting the print-output of gnuplot

[Hans-Bernhard B. <br...@ph...>]

David Rabanus wrote:

> print "Value: %.2f",VALUE

[...]
> Any idea how to set that in gnuplot*

You don't.  'set label' has this behaviour, but not 'print'.

Re: [Gnuplot-info] question

[Hans-Bernhard B. <br...@ph...>]

Ignacio Palacios Garcia wrote:
> I don`t how create a image gif wiht two plot. Only do one plot.

  plot 'data1', 'data2', sin(x)

will plot all three things in a single plot.  If that's not what you 
wanted, you'll have to explain in more details what it is you want.

> I use windows 2000, gnplot 3.7

Please upgrade before doing anything else.  We're at version 4.0 now, 
and we really don't have the manpower to spare to support outdated versions.

Re: [Gnuplot-info] terminal pstricks

[Hans-Bernhard B. <br...@ph...>]

Philippe DELAVALADE wrote:

> In my file ".gnuplot" I have the following lines :
> 
> set terminal pstricks
> set size square

On a side note, I seriously doubt it's good idea to put *these*
commands into the gnuplot startup script.   They belong into individual
plot scripts.

> This should give me a graph whith the same unit on x and y axis ; but in
> the output file I obtain :
> 
> \psset{unit=5.0in,xunit=5.0in,yunit=3.0in}
> \pspicture(0.000000,0.000000)(1.000000,1.000000)
> 
> This is obviously not what I want !

I think it is --- you just don't recognize it because you're looking at 
the wrong piece of information.

'set size square' will give you a square-shaped *plotting area*, not a 
square image file.

> If I print it to be sure, it's not good.

How did you print it, and what exactly is "not good" about it?

> What is wrong with my set terminal command ?

Nothing, as far as I'm aware.

[Gnuplot-info] REQ: Help with formatting the print-output of gnuplot

[David R. <ra...@ph...>]

Dear folks,

in gnuplot 3.7 patchleve 3 I have no idea to format the print 
output. I want to achieve something like in C like

print "Value: %.2f",VALUE

such that the double number VALUE is grinte on the screen with 
only two cifers at the right of the decimal point.

Any idea how to set that in gnuplot*

Best regards and thanks in advance - David Rabanus

[Gnuplot-info] question

[<na...@in...>]

Hi
sorry for my English

I don`t how create a image gif wiht two plot. Only do one plot.

I use windows 2000, gnplot 3.7

Thanks

Nacho
Jos=E9 Ignacio Palacio=20

E.T. del  G.P.V. de Madrid y Castilla La Mancha
na...@in...

[Gnuplot-info] terminal pstricks

[Philippe D. <phi...@wa...>]

Hi everybody,

I'm new on this list.

I'm still using gnuplot version 3.7 because I cann't install version 4.0
but this is another story :-)

In my file ".gnuplot" I have the following lines :

set terminal pstricks
set size square

This should give me a graph whith the same unit on x and y axis ; but in
the output file I obtain :

\psset{unit=5.0in,xunit=5.0in,yunit=3.0in}
\pspicture(0.000000,0.000000)(1.000000,1.000000)

This is obviously not what I want !
If I print it to be sure, it's not good.

If I substitute the line :

set terminal pstricks

with

set terminal pstricks unit
(has said in the info)
or with something like

set terminal pstricks unit=15.0cm

the first line mentionned in the output file, that is to say
\psset{unit=5.0in,xunit=5.0in,yunit=3.0in}
simply disappears.

What is wrong with my set terminal command ?

Thanks for help

Philippe

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Re: [Gnuplot-info] scientific numbers

[Hans-Bernhard B. <Han...@ph...>]

G S wrote:
> Is there any way to disdable scientific numerals from printing on the y 
> axis of my graphs?

See

	help set format

Re: [Gnuplot-info] ugly graph

[Hans-Bernhard B. <Han...@ph...>]

G S wrote:
> I would prefer curvy lines, but I just can;t seem to make this look like 
> a nicer chart.

This is your problem:

> set timefmt "%m/%d/%y %H%M"

Your data has a ':' between hours and minutes, but your format string
doesn't.  As a consequence, the minutes field of your data is completely 
ignored, and you get all points quantized to the previous full hour.

Make that line

set timefmt "%m/%d/%y %H:%M"

and you should be up and running.

[Gnuplot-info] scientific numbers

[G S <gsp...@ya...>]

Is there any way to disdable scientific numerals from printing on the y axis of my graphs?

 

thanks,

Guy

		
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[Gnuplot-info] Re: ugly graph

[G S <gsp...@ya...>]

I see ... I substituted by lowercase "y" in place of the following:
set timefmt "%m/%d/%Y %H:%M"
 
and it worked.
 
Sorry for the spam!
Guy

G S <gsp...@ya...> wrote:

Thanks KM.  Unfortunatly, they are still blocky, as opposed to flowing.  I commented out that line

 

 

 

set timefmt "%m/%d/%Y %H:%M"

k.m :)

 

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[Gnuplot-info] Logarithmic minor tics problem

[<And...@et...>]

Hi,

I have a problem with logarithmic tics. If I set the xrange limits to
integer powers of 10 (1, 10, 100, 1000, ...), everything works fine.
But try this simple example with gnuplot-4.0:

set logscale x
set xrange[50:5000]
set xtics 10
set mxtics 10
set grid x y mx
plot sin(log(x))

As you may notice, the minor x-tics between 50 and 100 are present
as expected, but the ones between 1000 and 5000 are not!
Now type the commands

set mxtics default
replot

and the minor x-tics for x>1000 are present as expected.
The same behaviour applies to a logarithmic y-axis.
Is this a bug or a feature?

Thanks and Regards,

Andreas.

[Gnuplot-info] Conferma la tua richiesta di iscrizione a buonenuove

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