MATLAB: Finding location of logical 1 row wise by column

findlocationlogical?MATLAB

Hi, I have a 8 x 621 logical and I would like to extract the row location of the logical 1 by columns i.e the result should be ans = [ 5 8 3 8 ….]

How may I do that?

Thank you!

Best Answer

[idr,~] = find(yourMatrix)

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MATLAB: Finding the row/column locations of 1s in a boolean matrix

A = rand(3)>.5;
[I,J] = find(A) % I is the rows, J is the cols.

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For example,

A=[4 5 6 7; 8 4 5 6; 4 5 6 8; 8 4 8 9 ;1 2 2 4; 4 5 6 8]; % A matrix
v = [4 5 6 8]; % vector you are searching for
[flag,locs] = ismember(A,v,'rows'); % flag gives logical true for each row if v is equal to corresponding row of A 
locations = find(flag); % if you want to get exact location such as 3rd row, 5th row and if you are using with rows option, use this.

Best Answer

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MATLAB: Finding the row/column locations of 1s in a boolean matrix

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