Big Data math operations

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Ahmed raafat 2021-12-4

评论： Matt J 2021-12-6

I have matrix 414588x47236 want to make PCA dimension reduction on it

is there any idea to make so my computer is not crashing and minimze operation time?

Mike Croucher 2021-12-4

What kind of matrix is it? Is it sparse or dense? Double precision? Single precision?

Is the matrix stored in a file? .mat or .csv or something else?

Have you managed to load it into MATLAB at all? What are the specifications of the machine you are using?

Ahmed raafat 2021-12-5

it is sparse matrix , uploaded into matlab from mat file

when I try to use pca command it send error that can't deal with sparse

Matt J 2021-12-5

You could do,

[U,S]=svds(A,k);
A_reduced=U*S;

Ahmed raafat 2021-12-6

and for PCA , what command?

Matt J 2021-12-6

A_reduced is the result of the PCA.

在 Help Center 和 File Exchange 中查找有关 Dimensionality Reduction and Feature Extraction 的更多信息

R2021b

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