How to get contour or surface plot form datafile (with gnuplot)?
Hello,
I would like to use gnuplot to plot my 2d function ch(x,y) [generated by FreeFem++]. My datafile is structured in this way: x1 y1 ch(x1,y1) x2 x2 ch(x2,y2) x3 y3 ch(x3,y3) x1 y1 ch(x1,y1) x4 y4 ch(x4,y4) ... ... ... ... where I have the value of my function at the 3 vertices of every triangle which constitutes my (triangular, not structured) mesh (see figure here http://i65.tinypic.com/2mydkq9.jpg). What I would like to get is two separate figures: 1. something like this for the surface, with a colorbar as a legend: http://i68.tinypic.com/egvkzr.jpg and 2. something like this for contour lines, with a colorbar as a legend: http://i67.tinypic.com/msgepg.jpg How can I get these two figures with gnuplot? I've tried for example doing the first one : set palette rgbformulae 33,13,10 set xrange [0: 0.25] set yrange [0: 0.20] set view map splot "mydatafile.txt" w l pal but the triangles inside are white (not filled with colors) and only the edges of the triangles are coloured. How about the contour lines? Thank you in advance, Keccogrin |
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