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blitzpp / blitz

Blitz++ Multi-Dimensional Array Library for C++
https://github.com/blitzpp/blitz/wiki
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[efficient matrix multiplication] with only blitz-inbuilt-features #118

Closed ClmnsRck closed 5 years ago

ClmnsRck commented 5 years ago

The title says it all, but what is the fastest way to do Matrix-multiplication on two blitz::Array's? 

A = sum(B(i,j) * C(j,k), j);

This is terribly slow.

citibeth commented 5 years ago

Write a loop? Use Eigen::Map<Eigen::Matrix<>> on it?

On Tue, Apr 23, 2019 at 05:26 ClmnsRck notifications@github.com wrote:

The title says it all, but what is the fastetst way to do Matrix-multiplication on two blitz::Array's?

A = sum(B(i,j) * C(j,k), j);

This is terribly slow.

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ClmnsRck commented 5 years ago

Well then it would not be using only blitz-built-in features, would it? i'll try the loop ...

citibeth commented 5 years ago

Not using blot built in features doesn’t bother me. Blitz is good at storage, Eigen is good at algorithms.

On Tue, Apr 23, 2019 at 06:28 ClmnsRck notifications@github.com wrote:

Well then it would not be using only blitz-built-in features, would it? i'll try the loop ...

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