Collect only non-zero elements of a 3x3xN matrix

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Marco
Marco 2013-1-18
Hi,
I've a symbolic 3x3xN (with N variable) matrix I with some non-zero elements, like:
I(:,:,1) =
[ 0, 0, 0]
[ 0, 0, 0]
[ 0, 0, Il1]
I(:,:,2) =
[ 0, 0, 0]
[ 0, 0, 0]
[ 0, 0, Il2]
and I want to collect them into an array, but when I try:
[m,v]=find(I~=0)
it returns indices like m=3 v=9. How can I find them from the 3-D matrix and collect them into an array ?

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采纳的回答

Image Analyst
Image Analyst 2013-1-18
编辑：Image Analyst 2013-1-18
You simply extract them, like this:
nonZeroElements = I(I~=0);
That gives you a big long vector of all the array values that are not zero, in row major order.

更多回答（1 个）

Matt J
Matt J 2013-1-18
I don't have the Symbolic Math Toolbox, but you could try the NONZEROS command. Don't know if it's overloaded for type sym.

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