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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