How to get a contour plot from the combination of "for loop" and "matrix operation"?

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Nasir Mehmood 2020-9-28

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评论： madhan ravi 2020-9-28

How to get a contour plot of say z = matrix_a * matrix_b?

Here matrix_a = f(x,y), matrix_b = f(x,y) and f(x,y) may be a complex function.

Possible approach may look like this:

Loop1: x = variable

Loop2: y = variable

matrix_a = f(x,y)

matrix_b = f(x,y)

Result: z = matrix_a * matrix_b

contourf(x, y, real(z))

or

contourf(x, y, imag(z))

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Answer 1

madhan ravi 2020-9-28

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/601156-how-to-get-a-contour-plot-from-the-combination-of-for-loop-and-matrix-operation#answer_501592

在 MATLAB Online 中打开

[X, Y] = meshgrid(x, y);
Z = X .* Y;
contourf(X, Y, Z)

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Nasir Mehmood 2020-9-28

Thanks for a quick response dear Madhan Ravi.

However, the problem I encountered is different. I do not need a point-wise multiplication. Instead I need to multiply two matrices (matrix operation) which'll produce a single number (in case of a 1-by-n and n-by-1 matrix multiplication). Therefore I need to have multiple matrices (varying with x and y) and getting a set of values of z to be plotted.