How to make a contour plot with incomplete z data?

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Onur Kucuktas
Onur Kucuktas 2021-11-5
回答： Sulaymon Eshkabilov 2021-11-5
I have a collection of intersection points of a square plane. Each intersection point has an intensity associated with it (doing light ray tracing). I need the intensity to be the elevation of the contour plot, and the points to be the x and y respectively. Areas not intersected by any rays need to have an elevation of zero. I have a vector that has x values of intersection, a vector that has y values of intersection, and a vector that has intensities. I'm not sure how to make a contour plot using this information. Using the contourf function with those vectors as an input says that Z must be at least a 2x2 matrix, and I don't know how to form this matrix when basically any point that isn't included needs to have an elevation of 0. Any guidance is appreciated!

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Sulaymon Eshkabilov
Ran in:
As I understood your question correctly, you'd need to employ something like this one to get controurf(Z) from the values of X and Y.
X = randi(255, 25, 1);
Y = randi(255, 25, 1);
XY = [X.*(X>175), Y.*(Y>175)];
Z = XY;
contourf(Z)

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