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From: "Theodor Zouk" <rebet4@hotmail.com>
Newsgroups: comp.soft-sys.matlab
Subject: sparsing 3-D array
Date: Thu, 4 Dec 2008 10:16:03 +0000 (UTC)
Organization: Univ of Umea
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Hi

Is there any function in matlab that can sparse arrays with a higher dimension than 2?

What i have is a mulstidimension array that is 256x256x256 elements long. Now, Im know that 4096 of these entries have an value and the rest has the value of zero (= a hell of a lot of zeros =). This multidim array ("cube") is used in a loop where this array is added,subtracted,multiplied elementwise with other multidim arrays also constisting of a lot of zeros. The 4096 entries can be different from each iteration.
I think that i will gain some execution speed if i can sparse these multidim arrays and then "eliminate" the calculations over the zeros value entries (elements)...

regards

Theo