Plotting values with colormap of xy-plane?

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Sharif Khalil 2018-7-23

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https://ww2.mathworks.cn/matlabcentral/answers/411783-plotting-values-with-colormap-of-xy-plane

评论： Sharif Khalil 2018-7-24

I have used countourf(X,Y,Z); I have X, Y, Z are (11X300) matrix; I need to plot values of Z with different colors on a x-y plane. note that X is originally a vector(1X300) and Y is (1X11), by meshgrid it was turned into the same size of Z. I do not know how to plot Z values on the x-y plane with different colors.

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Walter Roberson 2018-7-24

contourf() uses different colors for different z values by default.

Sharif Khalil 2018-7-24

Yes, I needed another way for plotting, since I didn't like the result, I found surf() with view(90) gives a better looking plot, thanks.

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Answer 1

Walter Roberson 2018-7-24

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https://ww2.mathworks.cn/matlabcentral/answers/411783-plotting-values-with-colormap-of-xy-plane#answer_330153

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pcolor(X, Y, Z) is the same as surf(X, Y, Z, 'edgecolor', 'none') followed by view(90)

If your X and Y are consecutive integers starting from 1, then you could just

pcolor(Z)

Note that when you pcolor or surf, that the number of output "pixels" is one fewer in each direction than the number of rows or columns. surf determines the color of each pixel by interpolation from the four corner vertices.

If your X and Y are linear and equidistant, you could consider using

imagesc(X, Y, Z)