contourlines in 3d field

contourlines in 3d field

Post by Thorsten Kamp » Fri, 06 Dec 1996 04:00:00



Hi,

i've got a 3d-field of data, x and y are
coordinates, z is an amplitude varying between -1
and 1. I want to have a projection of the data in
the x,y-square with lines corresponding to z-values
1, 0.9, 0.8, 0.7 ... -0.8, -0.9, -1. How can i plot
such isolines with gnuplot

Please mail me,
 thanks in advance

 Thorsten Kamps

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1. contourlines problem


I've noticed this in the past.  I believe that the algorithm isn't
symmetric, in that if it passes through the data top to bottom, it
gets a different result than if it passes the other way.

I can imagine an algorithm that behaves this way, but I've not had
the time or patience to wade through the code to see how gnuplot's
contouring works, if it's relatively easily fixable or if it needs
a wholesale rewrite.

I know this doesn't really help :-(


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