Raising a scalar to each element in a matrix

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J
J 2022-5-17
编辑： Torsten 2022-5-17
Ran in:
I have tried to raise e to the power of each element of a matrix for a contour plot of e^(1/X)/Y and got the error message for non-finite ZData. I was wondering whether the operation has done a form of matrix multiplication and added multiple elements results instead of outputting e^(ij) for element ij.
Thanks
x = linspace(0,50);
y = linspace(0,50);
[X,Y] = meshgrid(x,y);
Z = expm(X.^(-1))*(Y.^(-1));
contour(X,Y,Z);
Warning: Contour not rendered for non-finite ZData

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回答（1 个）

Torsten
Torsten 2022-5-17
编辑：Torsten 2022-5-17
expm is incorrect, use exp.
And you shouldn't divide by 0 - not for X and not for Y.
x = linspace(1,50);
y = linspace(1,50);
[X,Y] = meshgrid(x,y);
Z = exp(1./(X.*Y));
contour(X,Y,Z)

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