block diagonal multiplication

Version 1.1.0.0 (2.27 KB) by David Holdaway
Used for multiplying large block diagonal matrices with matrices / vectors.
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Updated 26 Apr 2012

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Used to perform B*M or M*B with B a block diagonal matrix, B is stored as a cell array (call it C) with each element a matrix as a block of B, such that B = blkdiag(C{:}).
This speeds up the multiplication when B is large and also allows the operation to take place when B could not fit in the memory stored as a full block diagonal matrix.
Operations B'*M = (M'*B)' and M*B' can be performed using transpose identities

Cite As

David Holdaway (2026). block diagonal multiplication (https://uk.mathworks.com/matlabcentral/fileexchange/35717-block-diagonal-multiplication), MATLAB Central File Exchange. Retrieved .

MATLAB Release Compatibility
Created with R2012a
Compatible with any release
Platform Compatibility
Windows macOS Linux
Categories
Find more on Operating on Diagonal Matrices in Help Center and MATLAB Answers
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Version Published Release Notes
1.1.0.0

Modified the program to give an error rather than a warning when the matrix multiplication is not possible. Changed the way the program deals with sparse inputs, only converting sections to full matrices when an extra argument "tryfull" is given.

1.0.0.0