# How to plot solution of a 2D edp on a 1D line
**URL:** https://community.freefem.org/t/how-to-plot-solution-of-a-2d-edp-on-a-1d-line/513
**Category:** General Discussion
**Created:** [July 22, 2020, 9:57am UTC](https://community.freefem.org/t/how-to-plot-solution-of-a-2d-edp-on-a-1d-line/513 "2020-07-22T09:57:45Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@Trophime](https://community.freefem.org/u/Trophime)
#### Post date: [July 22, 2020, 9:57am UTC](https://community.freefem.org/t/how-to-plot-solution-of-a-2d-edp-on-a-1d-line/513/1 "2020-07-22T09:57:45Z")
Hi,
I would like to plot the solution of 2D edp on a line using for instance gnuplot.
How can I get this done?
More generally I would like to plot solution on a given contour.
How can I define this contour and interpolate the solution on points lying on this contour.
Thanks for help
Best
C
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### Author:  [@prj](https://community.freefem.org/u/prj)
#### Post date: [July 22, 2020, 11:18am UTC](https://community.freefem.org/t/how-to-plot-solution-of-a-2d-edp-on-a-1d-line/513/2 "2020-07-22T11:18:37Z")
Hello Christophe,
Probably [this](https://github.com/FreeFem/FreeFem-sources/blob/46d9e0efbbe1f15a88b0a4282c4f1113dddeb317/examples/tutorial/gnuplot.edp) example or [that](https://github.com/FreeFem/FreeFem-sources/blob/ab09a0cf3b0bbfedd6a03f760cb8563d04a83846/examples/mpi/NSCaraCyl.edp#L46) one can help you achieve what you want?
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### Author:  [@Trophime](https://community.freefem.org/u/Trophime)
#### Post date: [July 22, 2020, 6:47pm UTC](https://community.freefem.org/t/how-to-plot-solution-of-a-2d-edp-on-a-1d-line/513/3 "2020-07-22T18:47:47Z")
Hi Pierre, Thanks example 1 is perfect.