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Extract multiple matrices from an array by excluding specified numbers.

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Let's say i got an array like [0 0 0 3 5 7 2 1 4 0 0 0 4 7 8 5 2 4] .
I want to build matrices excluding all zeroes and get 3x2 matrices with remaining values like
A = 3 2 & B= 4 5
5 1 7 2
7 4 8 4
How can this be done? Thanks.

Accepted Answer

David Fletcher
David Fletcher on 22 May 2021
Edited: David Fletcher on 22 May 2021
Will do the job in this case, but is not massively robust. Would need additional code to enforce the number of elements in the vector being reshaped if there is a chance it will not be a multiple of (six in this case)
vec=[0 0 0 3 5 7 2 1 4 0 0 0 4 7 8 5 2 4];
%Remove zeros
vec(vec==0)=[];
index=1;
for iter=1:6:numel(vec)
%Reshape remaining vector into a 3x2 and store
mat(:,:,index)=reshape(vec(iter:iter+5),[],2);
index=index+1;
end
mat(:,:,1)
ans = 3×2
3 2 5 1 7 4
mat(:,:,2)
ans = 3×2
4 5 7 2 8 4

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