Mask the matrix

[Xin Dong]

Hi,

I have a program that generates a two row matrix with zero elements. I wanna
extract out the columns with elements in both rows are non-zero. For
example, if the matrix is
a = [ 1 0 2 3 4; 2 1 0 0 4],
I wanna get
b = [1 4; 2 4].
How can I use octave to do this?

Thanks,
Xin
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