gnuplot-info

[Gnuplot-info] how to plot a line in the contour map

[thorneliu <liu...@co...>]

Hello, every one!
Here is my question:
  I have a matrix data file (data in rows and collums),
  and I successfully got a contour figure by the following commands:
  
  set pm3d map
splot 'matrix.dat' matrix

Well, I got the figure as follows:
http://old.nabble.com/file/p28812980/Dis1550.jpg 

So, what can I do if I wanna plot a line in this contour figure?
(I wanna plot the line where z=0 in the x y plane)
Thanks a lot!
 
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Re: [Gnuplot-info] how to plot a line in the contour map

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

so you want not to plot 'just a line' but a contour line,
that's easy:

set contour surface
set cntrparam levels discrete 0
set pm3d map
splot 'matrix.dat' matrix


thorneliu wrote:
> 
> Hello, every one!
> Here is my question:
>   I have a matrix data file (data in rows and collums),
>   and I successfully got a contour figure by the following commands:
>   
>   set pm3d map
> splot 'matrix.dat' matrix
> 
> Well, I got the figure as follows:
>  http://old.nabble.com/file/p28812980/Dis1550.jpg 
> 
> So, what can I do if I wanna plot a line in this contour figure?
> (I wanna plot the line where z=0 in the x y plane)
> Thanks a lot!
>  
> 

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Re: [Gnuplot-info] how to plot a line in the contour map

[thorneliu <liu...@co...>]

Well,thanks
By the way, what can i do if I wanna just plot a line (not a contour line)
in this plot?

Thomas Sefzick wrote:
> 
> so you want not to plot 'just a line' but a contour line,
> that's easy:
> 
> set contour surface
> set cntrparam levels discrete 0
> set pm3d map
> splot 'matrix.dat' matrix
> 
> 
> thorneliu wrote:
>> 
>> Hello, every one!
>> Here is my question:
>>   I have a matrix data file (data in rows and collums),
>>   and I successfully got a contour figure by the following commands:
>>   
>>   set pm3d map
>> splot 'matrix.dat' matrix
>> 
>> Well, I got the figure as follows:
>>  http://old.nabble.com/file/p28812980/Dis1550.jpg 
>> 
>> So, what can I do if I wanna plot a line in this contour figure?
>> (I wanna plot the line where z=0 in the x y plane)
>> Thanks a lot!
>>  
>> 
> 
> 

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Re: [Gnuplot-info] how to plot a line in the contour map

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

are you looking for e.g. something like this:

http://old.nabble.com/file/p28822118/ts.gif 

a coloured surface with lines where z=10?

set size square
set pm3d map
set contour surface
set cntrparam levels discr 10
set samples 20
set isosamples 20
splot x*y


thorneliu wrote:
> 
> Well,thanks
> But I could not get a line (z=0) in my previos figure.
> And another question:
> By the way, what can i do if I wanna just plot a line (not a contour line)
> in this plot?
> for example : 
> I have another matrix file
> I want to plot the contour figure as the figure I inserted before, and I
> want to draw a line where Z is the minimums in the 
> x y plane.
> what can I do?
> I hope I have made myself understood.
> Thanks.
> 
> Thomas Sefzick wrote:
>> 
>> so you want not to plot 'just a line' but a contour line,
>> that's easy:
>> 
>> set contour surface
>> set cntrparam levels discrete 0
>> set pm3d map
>> splot 'matrix.dat' matrix
>> 
> 
> 

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Re: [Gnuplot-info] how to plot a line in the contour map

[thorneliu <liu...@co...>]

Oh,yes 
This is really what i want.
I tested the codes you posted and I got the right figure in another PC with
gnuplot 4.2.6 installed.
I think the failure in my Debian GNU/Linux system results form that I am
using an old version gnuplot.
Thanks a lot.
Problem Solved.

thorneliu wrote:
> 
> Well,thanks
> But I could not get a line (z=0) in my previos figure.
> And another question:
> By the way, what can i do if I wanna just plot a line (not a contour line)
> in this plot?
> for example : 
> I have another matrix file
> I want to plot the contour figure as the figure I inserted before, and I
> want to draw a line where Z is the minimums in the 
> x y plane.
> what can I do?
> I hope I have made myself understood.
> Thanks.
> 
> Thomas Sefzick wrote:
>> 
>> so you want not to plot 'just a line' but a contour line,
>> that's easy:
>> 
>> set contour surface
>> set cntrparam levels discrete 0
>> set pm3d map
>> splot 'matrix.dat' matrix
>> 
> 
> 

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