gnuplot-info — For questions and discussion about gnuplot

Re: [Gnuplot-info] passing comments

[bittersweet <noo...@gm...>]

Hi. For the time being, I just want to plot a simple sin(x) graph. Can i put
it in this way?

        FILE *pid;

	pid = _popen ("wgnuplot.exe", "w");

	if (pid < 0)
	{
		perror("Can't open wgnuplot!\n");
	}

	else
	{
		printf("Open file suceeded!\n");
		fprintf(pid, "plot sin(x)");
		system("type wgnuplot.exe");
		_pclose(pid);
	}
-- 
View this message in context: http://www.nabble.com/passing-comments-tf3649531.html#a10212382
Sent from the Gnuplot - User mailing list archive at Nabble.com.

Re: [Gnuplot-info] How to get y2 axis labels automatically?

[Skip M. <sk...@po...>]

> How do I get
> rid of the now duplicate y1 tics which are displayed on the y2 axis?

Never mind.  A closer read of the set xtics docs revealed the {no}mirror
parameter.

Skip

Re: [Gnuplot-info] How to get y2 axis labels automatically?

[Skip M. <sk...@po...>]

    > y2tics labels are hidden by default. You should set y2tics ...

Thanks, that worked to get the y2 tics displayed and labeled.  How do I get
rid of the now duplicate y1 tics which are displayed on the y2 axis?

Re: [Gnuplot-info] How to get y2 axis labels automatically?

[<as...@ca...>]

Hi!

y2tics labels are hidden by default. You should set y2tics before plot:

gnuplot> set y2tics

this should work. For further information, take a look at

gnuplot> help y2tics

or

gnuplot> help xtics

Cheers,

Hern=E1n


On 4/26/07, Skip Montanaro <sk...@po...> wrote:
>
> I am plotting two files using GNUplot 4.0.0.  They have the same x
> range but different y ranges, so I use the axes parameter to plot them
> appropriately:
>
>     plot "somefile" using 1:2 axes x1y1, \
>          "another1" using 1:2 axes x1y2
>
> This works fine, however the y2 axis is never labeled.  How do I coax
> GNUplot into labeling the y2 axis?
>
> Thanks,
>
> Skip Montanaro
>
>
>
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[Gnuplot-info] How to get y2 axis labels automatically?

[Skip M. <sk...@po...>]

I am plotting two files using GNUplot 4.0.0.  They have the same x
range but different y ranges, so I use the axes parameter to plot them
appropriately:

    plot "somefile" using 1:2 axes x1y1, \
	 "another1" using 1:2 axes x1y2

This works fine, however the y2 axis is never labeled.  How do I coax
GNUplot into labeling the y2 axis?

Thanks,

Skip Montanaro

Re: [Gnuplot-info] passing comments

[<HBB...@t-...>]

bittersweet wrote:

> how do I pass a comment e.g. plot sin(x) to gnuplot from visual c++?

Ah, that's a command you want to pass, not a comment.

> I have tried to use fprintf but it doesn't work?

You'll have to explain the context a lot better before we can help you 
with this.  fprintf() is the correct command to use.  The trick is how 
you *opened* that stream you're printing into.  It can be an ordinary 
file which you later pass to gnuplot as a command line argument, or it 
can be a pipe.  Look up system() and _popen() in your library reference 
manual(s).

Re: [Gnuplot-info] Beginners question about data plots

[<HBB...@t-...>]

Thomas Steinbrecher wrote:

> set bars 0
> plot 'data.dat' w yerrorlines
> 
> however, while the horizontal bars at the end of each errorbar are gone, 
> and the datapoints are connected by a line, there is still a horizontal 
> bar in the middle of each errorbar. 

That's not really a bar. It's the horizontal part of the point symbol 
that gnuplot puts in the middle of an errorbar.  You'll see it more 
easily if you change your plot command to:

	plot x, 'data.dat' w yerrorlines

If you don't want that, you can change the point symbol to a dot:

	plot 'data.dat' with yerrorlines pointtype -1

[Gnuplot-info] passing comments

[bittersweet <noo...@gm...>]

hi.

how do I pass a comment e.g. plot sin(x) to gnuplot from visual c++?
I have tried to use fprintf but it doesn't work?
Any idea anyone?
Thanks in advance!
-- 
View this message in context: http://www.nabble.com/passing-comments-tf3649531.html#a10194035
Sent from the Gnuplot - User mailing list archive at Nabble.com.

[Gnuplot-info] Beginners question about data plots

[Thomas S. <ste...@sc...>]

Dear gnuplot users,

I have a question about plotting data files with gnuplot. What I 
am trying to do is plot my data (x,y and delta-y columns) so that data 
points are connected by lines and the errorbar is represented by a 
plain vertical line. I tried to accomplish this by using

set bars 0
plot 'data.dat' w yerrorlines

however, while the horizontal bars at the end of each errorbar are gone, 
and the datapoints are connected by a line, there is still a horizontal 
bar in the middle of each errorbar. Is there any way to get rid of this?
I use gnuplot 4.0 patchlevel 0.

Please reply to ste...@sc..., for I am not on the list.

Any comments would be highly appreciated,

Kind Regards,

Dr. Thomas Steinbrecher
The Scripps Research Institute
10550 N. Torrey Pines Rd.
San Diego CA 92037, USA

[Gnuplot-info] key/legend feature request

[Sam S. <sd...@gn...>]

it would be nice if the default key/legend location were not fixed (top
right) but were instead selected to minimize overlap with the plot.
i.e., "set key optloc" ("optimal location") will place it in top left
for plots like y=x^2, bottom right for sqrt, top right for 1/x &c.

Re: [Gnuplot-info] error bars with lines

[<HBB...@t-...>]

Sam Steingold wrote:

> what baffles me is how to make the 3 lines have the same color.
> any suggestions?

Read the F* manual, for starters.  "help plot", and its subnode "help 
plot with", in particular.

Re: [Gnuplot-info] Calculation of Differential Quotient while plotting

[<HBB...@t-...>]

Stefan Rink wrote:
> is it possible to make gnuplot calculate the differential quotient  
> while plotting a data file?

No.  But you can have gnuplot place this work in the hands of another 
tool that is better suited to doing it.  E.g. a little awk or Perl 
script that you could run like this:

	plot '< diff_datafile 2 5 file.dat'

Re: [Gnuplot-info] Calculation of Differential Quotient while plotting

[Lars H. <la...@ho...>]

> is it possible to make gnuplot calculate the differential
> quotient while plotting a data file?
> I.e., instead of y plot y', or rather using (
> (y(n)-y(n-1)) / (x(n)-x (n-1)) )?

No, since gnuplot was designed to be a plot programme, not a 
formula manipulation programme. But as you are saying it is 
possible to calculate the differential quotient by hand. 
gnuplot only supports 'basic' mathematic facilities. See 
help expressions and help operators for more details.

Regards 
Lars

Re: [Gnuplot-info] 'column scatter plot'

[Adrian G. <har...@gm...>]

Hi Lars,

Lars Hoegen wrote:
  Maybe you'd like to consult the fine
> manual on these topis:
>   help pointsize
>   help style 
>   help set style

Thanks for the hints. I'll definitely look into it.

Adrian

[Gnuplot-info] Calculation of Differential Quotient while plotting

[Stefan R. <ste...@si...>]

Hello,


is it possible to make gnuplot calculate the differential quotient  
while plotting a data file?
I.e., instead of y plot y', or rather using ( (y(n)-y(n-1)) / (x(n)-x 
(n-1)) )?


Regards,
Stefan

[Gnuplot-info] gnuplot and visual c++

[bittersweet <noo...@gm...>]

Hi.

I am at loss on how to use gnuplot in visual c++. How do I call gnuplot from
visual c++? Can I use MFC to plot the 3D image? Thanks in adavnce.
-- 
View this message in context: http://www.nabble.com/gnuplot-and-visual-c%2B%2B-tf3643716.html#a10175968
Sent from the Gnuplot - User mailing list archive at Nabble.com.

[Gnuplot-info] error bars with lines

[Sam S. <sd...@gn...>]

I want to plot several series with error bars on the same plot.
for each series I want the following _lines_:
1. the main line along points (x,y)
2. the top line (x,y+ydelta)
3. the bottom line (x,y-ydelta)
4. the vertical error bar from (x,y-ydelta) to (x,y+ydelta) [this is 
actually optional because the series will have the same sets of Xs, so 
these bars will overlap anyway].

it does not look like either "with errorbars" or "with errorlines" does 
what I want, so I am prepared to pass 3*N series to gnuplot (I am doing 
this from lisp, so this is not that hard).

what baffles me is how to make the 3 lines have the same color.
any suggestions?

thanks.

Sam

Re: [Gnuplot-info] 'column scatter plot'

[Lars H. <la...@ho...>]

> Unfortunately, symbols of expression (y) values that are
> very close overlap, thus, obscuring each other. It would
> be better to plot it like in the graph given here:
> http://www.graphpad.com/faq/viewfaq.cfm?faq=145
>
> Can that be done in gnuplot as well? Maybe using an 'if'
> command? Note: There are too many values to do it
> manually, I'm afraid.

Hi Adrian,
the graph example you give uses equal piont types and sizes 
for all datapoints, which is the most reader-friendly way 
to handle the problem. 
gnuplot offers as well several point symbols as almoust free 
chosen size of these symbols (depends from the abilities of 
the terminal type). Maybe you'd like to consult the fine 
manual on these topis:
  help pointsize
  help style 
  help set style

HTH
Lars

[Gnuplot-info] 'column scatter plot'

[Adrian G. <har...@gm...>]

Hello,

I would like to plot (gene expression) values of two groups, say control 
and treated. Each group has several samples. I assign x-value 1 to group 
'control' and 2 to 'treated'.

Example for group 1:
x	expression
1	3
1	5
1	8
1	3.5
1	3.4
1	3.3
1	3.7
1	10
1	6
1	7
1	6.5
(I set y-range to [0:10])

Unfortunately, symbols of expression (y) values that are very close 
overlap, thus, obscuring each other. It would be better to plot it like 
in the graph given here:
http://www.graphpad.com/faq/viewfaq.cfm?faq=145

Can that be done in gnuplot as well? Maybe using an 'if' command? Note: 
There are too many values to do it manually, I'm afraid.

Grateful for any comments,

adrian

Re: [Gnuplot-info] Umuts questions

[Gavin B. <gav...@ya...>]

 Hi Umut,

Don't know what you mean by the 3d graphics question - do you mean like plotting the colors on planes through the 3d space? Or do you mean just plotting a smooth gridless function?

As for your question about the key, you set the title of your plot using title 'whatever' in your plot: see help plot.

Gavin.





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Re: [Gnuplot-info] 3d grid

[<HBB...@t-...>]

Umut Emin wrote:

> I want to have it in xyz -would look like small cubes cutting the
> whole function surface.

You may think you want that, but trust me: you don't. Such a grid would
be pretty much guaranteed to render the actual plot completely unreadable.

Re: [Gnuplot-info] set key for multiple funcs in a plot

[<HBB...@t-...>]

Umut Emin wrote:

> plot first_function set key "Inertia Part" , \
> second_function set key "Viscousity Part", \
> third function set key "Sum Force on Structure"
> 
> so that in the key area those three strings appear instead of
> function expressions?

Read 'help plot', particularly its subsection named 'title'.

[Gnuplot-info] set key for multiple funcs in a plot

[Umut E. <j.s...@o2...>]

Hei *,

I plot 3 functions in a graph and these functions are quite long. As the
plot appears then the key box occuppies the whole top side of the graph
cutting the functions at some areas. 

plot first_function  , \
second_function , \
third_function

Is there a possibility to do a:

plot first_function set key "Inertia Part" , \
second_function set key "Viscousity Part", \
third function set key "Sum Force on Structure"

so that in the key area those three strings appear instead of
function expressions?

Thanx,
Umut

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