MATLAB: Need half of the contour plot

contourplot

Hello I have a contour of the pressures over a surface. Basically, I had vectors x and y which were locations on the surface and on each location, I had a value for pressure. I have a rectangular plot. I was wondering if there is a way to split my plot from the diagonal and show just the results for either upper or lower triangles?

Best Answer

Check out the tril and triu functions. For example if you have data similar to
[x,y]= meshgrid(-1:.05:1);
z = x.^2+y.^2;
contour(x,y,z)
Try something like
zLowerTri = tril(z);
contour(x,y,zLowerTri)
Since contour plots with the origin at lower left instead of upper right, you may prefer either
zLowerTri = tril(z);
contour(x,y,zLowerTri)
axis ij
or
contour(x,y,fliplr(tril(fliplr(z))))
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