mex_sepsq

Version 1.8.0.0 (72,9 ko) par Ben Mitch
Fast, dedicated, code to compute Euclidean separation between sets of points in N-dimensional space.
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Mise à jour 22 nov. 2010

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To compute the Euclidean separation (L2 norm) between two sets of points in MATLAB can be slow and/or memory-hungry. In some cases (most particularly, if you are working with 2D, 3D or 4D data), this function will do it 2-4 times faster than the fastest m-code I've seen (due to Germano Gomes) and hundreds of times faster than a typical memory-efficient nested loop.

NB: for D much greater than 10-15, performance is better using GG's m-script. See the screenshot for a performance plot - green is GG, blue is mex_sepsq.

>> mex_sepsq_demo

A = randn(4, 5000);
B = randn(4, 5000);

C1 = mex_sepsq(A, B);
Elapsed time is 0.201335 seconds.

C2 = sepsq_gg(A, B);
Elapsed time is 0.517755 seconds.

Relative time per implementation: 1.00 2.57

Citation pour cette source

Ben Mitch (2025). mex_sepsq (https://www.mathworks.com/matlabcentral/fileexchange/3966-mex_sepsq), MATLAB Central File Exchange. Extrait(e) le .

Compatibilité avec les versions de MATLAB
Créé avec R2010a
Compatible avec toutes les versions
Plateformes compatibles
Windows macOS Linux
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Version Publié le Notes de version
1.8.0.0

whoops, broke the linux implementation - fixed, now.
1.7.0.0

Improved performance, added benchmarking.
1.2.0.0

Provided a demo and an auto-compile script.
1.0.0.0