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[Stephen Cobeldick]

https://web.archive.org/web/20201115173339/https://webcache.googleusercontent.com/search?q=cache%3A76RAlGT668EJ%3Ahttps%3A%2F%2Fwww.mathworks.com%2Fmatlabcentral%2Fanswers%2F648653-array-operation-easy-question-about-formula

[Stephen Cobeldick]

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

Answer 1

[Ameer Hamza]

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().

[Ameer Hamza]

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.