finding all indices of a value in matrix
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sambhav jain
on 18 Feb 2020
Commented: sambhav jain
on 18 Feb 2020
i have a matrix say
[2 2 3 ;
2 4 2;
2 3 2]
how do i find all the indices (row, column) of 2 (minimum value element of matrix) in the given matrix?
4 Comments
Stephen23
on 18 Feb 2020
"but could you plz tell how is it better by not using find?"
It isn't better, it just demonstrates that every problem can be approached in different ways, and hopefully shows a different way to think about the problem.
Accepted Answer
Rafael Hernandez-Walls
on 18 Feb 2020
A=[2 2 3 ;
2 4 2;
2 3 2];
[r,c]=find(A==min(A))
More Answers (1)
Steven Lord
on 18 Feb 2020
Do you need the locations or do you simply need to refer to the locations where the specified value occurs? Those are two slightly different things. If the latter, you don't need to use find and don't need to compute the indices at all.
Use logical indexing.
A = [2 2 3 ; 2 4 2; 2 3 2]
B = A; % Make a copy of A for future reference
two = A == 2 % Create a logical mask
B(two) = -1 % Replace all 2's in (the copy of) A with -1
In this example, I don't care where the 2's were in A. I only cared that I could change those elements.
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