Extract numbers from matrix based on logical array

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RE
RE 2023-4-13
回答： dpb 2023-4-14
I want to extract the numbers from a matrix 'x' using a logical array 'y':
x =
0.5853 0.2551 0.8909
0.2238 0.5060 0.9593
0.7513 0.6991 0.5472
y =
0 1 1
1 1 0
1 0 1
I want the solution to be in a 3x2 matrix, so something like this: z = [0.2551 0.8909; 0.2238 0.5060; 0.7513 0.5472].
If possible, no for loops should be used. I tried z=x(y==1), but that puts out a 6x1 matrix

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采纳的回答

dpb
dpb 2023-4-14
Ran in:
x =[
0.5853 0.2551 0.8909
0.2238 0.5060 0.9593
0.7513 0.6991 0.5472].';
y =logical([
0 1 1
1 1 0
1 0 1]).';
N=sum(y);
assert(all(N==N(1)),'Unequal numbers selected')
z=reshape(x(y),N(1),[]).'
z = 3×2
0.2551 0.8909 0.2238 0.5060 0.7513 0.5472

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