How can i implement subtraction without using for-loop ?

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Gn Gnk
Gn Gnk 2020-9-29
回答： Walter Roberson 2020-9-29
I have a vector J 1000x7 and a vector K 16x7
I want to take each row of J(one at a time) an subtract it from every row of K.
For example i want to take the first row of J and subtract it from each row of K and then take the 2nd row of J and do the same .
How can i implement this without using for-loop (because for loop is too slow for my programm).

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回答（1 个）

Walter Roberson
Walter Roberson 2020-9-29
JminusK = J - permute(K, [3 2 1]);
The size of JminusK will be 1000 x 7 x 16.

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