Is it possible to improve performance of the Kron operator by making it a built in function rather than using m-file implementation?
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MathWorks Support Team
el 9 de En. de 2014
Editada: MathWorks Support Team
el 19 de Abr. de 2021
I use the kron operator as well as row-wise and column-wise Kronecker operators extensively in my work and in packages I write in Matlab. Given the importance of these operators it would be nice to have intrinsic functions rather than m-files implementations. For years I have relied on MEX file versions that I wrote which can be hundreds of times faster than the m-file versions, especially for sparse matrices. I would like you to consider providing intrincis versions of these operators. I've attached my MEX file versions which you are welcome to use.
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MathWorks Support Team
el 21 de Oct. de 2019
The functionality requested is currently unavailable in MATLAB. This has been forwarded to our Developers as an enhancement request.
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Matt J
el 29 de Abr. de 2020
Fabricius Somogyi's comment moved here:
Unfortunately I cannot find the MEX files that you attached in this thread. Could you kindly re-attach them? I am having similar issues with kron() being too slow for my purposes. Thanks!
Matt J
el 18 de Ag. de 2020
amir sh's comment moved here:
is it possible for you to re-attach the MEX file?
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Matt J
el 9 de En. de 2014
Editada: MathWorks Support Team
el 19 de Abr. de 2021
I wouldn't expect an intrinsic implementation to improve much. Most of the computational intensity of KRON is in all the multiplication operations required and those are well-accelerated through calls to BSXFUN.
Also, there are many operations involving Kronecker product matrices that are more efficiently done without computing the product explicitly with KRON. See here for a tool that facilitates this,
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