sumDiag

Version 1.4.0.0 (1,59 KB) von Marcus Björk
Sum over each diagonal (or anti-diagonal) in a matrix
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Aktualisiert 5. Nov 2013

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Efficient and compact code for summing each diagonal (or anti-diagonal) in a matrix without using a for-loop.
Works well for large matrices.
For 3D matrix input A, the sum of diagonals of A(:,:,k) are returned in
sumMat(:,k). The script is typically faster than a for-loop based approach when A is 3D.
The code is most efficient for wide or tall matrices. Inline the code when it is used as a part of an iterative algorithm, to avoid recomputing constant indexing matrices.

Note that a for-loop implementation with the diag() function can be faster, and has a lower memory requirement, especially in the square 2D case.

Zitieren als

Marcus Björk (2026). sumDiag (https://de.mathworks.com/matlabcentral/fileexchange/44162-sumdiag), MATLAB Central File Exchange. Abgerufen.

Kompatibilität der MATLAB-Version
Erstellt mit R2013b
Kompatibel mit allen Versionen
Plattform-Kompatibilität
Windows macOS Linux
Kategorien
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Version Veröffentlicht Versionshinweise
1.4.0.0

Added support for 3D matrices as input.
1.1.0.0

Added comment on the speed of the implementation compared to using a for-loop approach.
1.0.0.0