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Why can the coordinates in "stem3" be defined only as vectors not matrices?

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Why can the coordinates in "stem3" be defined only as vectors not matrices?

Accepted Answer

Star Strider
Star Strider on 22 Jan 2017
The stem plots are intended to depict discrete data, specifically relating to signal processing, not the continuous data of other plots. If you have a matrix, use surf or mesh or related functions.
You can use stem3 with matrix arguments if you convert them into vectors first. For example if ‘X’, ‘Y’ and ‘Z’ are equal-sized matrices, you can convert them to vectors and plot them as:
figure(1)
stem3(X(:), Y(:), Z(:))
grid on

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