How to speed up large marix multiply?
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Now I have a large matix A and I need to do A*A', how to make this as fast as possible?
eg. A = zeros(40000,1000);
B = A*A';
2 Kommentare
Jan
am 24 Jun. 2019
Do the matrices have a pattern or are they sparse? Why do you assume that there is anything better than A*A' ?
Antworten (1)
Matt J
am 24 Jun. 2019
Bearbeitet: Matt J
am 24 Jun. 2019
3 Kommentare
Jan
am 8 Jul. 2019
@Joss: What does "internally supported" exactly mean? Does the JIT acceleration omit the explicit transposition?
Joss Knight
am 3 Aug. 2019
It's not the JIT it's the interpreter. When it sees x'*y, x*y', x'*y' or the dot equivalents (.') it calls a special mtimes-transpose operation that includes the information about which arguments are transposed (or conjugate-transposed), rather than applying the transpose operations separately.
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