Array Operation Easy Question about formula.

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Mateusz Zak
Mateusz Zak 2020-11-15
评论： Rena Berman 2021-5-7
Hello
Why this equation is possible to solve in the current matlab, despite the fact that a few years ago it was impossible ?
X = [ 1;2;3] Y = [ 4;5;6] X'.*Y.
MATLAB R202b
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Stephen23
Stephen23 2020-11-15
Original question by Mateusz Zak:
Array Operation Easy Question about formula.
Hello
Why this equation is possible to solve in the current matlab, despite the fact that a few years ago it was impossible ?
X = [ 1;2;3] Y = [ 4;5;6] X'.*Y.
MATLAB R202b
Original comment by Mateusz Zak:
Sorry.
X = [ 1;2;3] Y = [ 4;5;6] X'.*Y

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回答（1 个）

Ameer Hamza
Ameer Hamza 2020-11-15
编辑：Ameer Hamza 2020-11-15
It was introduced in R2016b. Read all about it here: https://blogs.mathworks.com/loren/2016/10/24/matlab-arithmetic-expands-in-r2016b/. Previously such a thing was only possible through bsxfun().
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Ameer Hamza
Ameer Hamza 2020-11-15
Yes, MATLAB automatically expand both matrices to have equal size and then use element-wise operation. In your case X' is [1x3] and Y is [3x1]. MATLAB repeat elements of X' and Y to make them 3x3 matrices.

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