How to select certain columns of a matrix only when the first two rows always show 1 and the other two rows a 0?

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Kim Arnold
Kim Arnold 2020-9-28
评论： Kim Arnold 2020-10-1
Hi everybody!
I have a Matrix with 4 rows and 922 columns M(4,2300) containing ones and zeros as shown below
1 0 1 1 ...
1 0 1 1 ...
0 0 0 1 ...
0 0 0 0 ...
I want to keep only the columns when the first two rows show a 1 and row three and four show a zero.
In the example above column 1 and 3 fulfill the conditions whereas column 2 and 4 don't.
Does somebody have a nice idea to write a simple code to extract the columns to have an output for the example above like: [1 0 1 0]?
Thanks a lot for your help guys!!!

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Jalaj Gambhir
Jalaj Gambhir 2020-10-1
Hi,
Use:
col = find(all(matrix(1:4,:)==[1;1;0;0]))
This will give you all the columns that satisfy this condition. You can then use
matrix(:,col)
to extract those columns from the matrix.
Hope this helps!

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