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  • License: Freeware
  • Last update: 6 years ago
  • Total downloads: 92
  • Price: Free |
  • Operating system: Linux, Mac OS X, Win All, BSD, Solaris
  • Publisher: Ben Mitch (10 other programs)
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scripts default iconmex_sepsq (Scripts) Publisher's description

To compute the Euclidean separation (L2 norm) between two sets of points in MATLAB can be slow and/or memory-hungry

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

System Requirements:

MATLAB 7.10 (2010a)
Program Release Status: New Release
Program Install Support: Install and Uninstall

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