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How do I find the largest elements in an array and make the other elements zero...
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How do I find the largest elements in an array and make the other elements zero in Matlab?
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This question already has an answer here:
- Get the indices of the n largest elements in a matrix 3 answers
Suppose I have a matrix
A=[2 3 4; 6 1 2]
I want to find 2 largest elements and make all the other elements zero. In this case A finally becomes
A=[0 0 4; 6 0 0]
Your line of action should be:
- Sort the matrix in descending order and obtain the order of the indices of the sorted elements.
- Discard the first two indices and use the rest to zero out the corresponding elements in
A.
Example
A = [2 3 4; 6 1 2];
[Y, idx] = sort(A(:), 'descend')
A(idx(3:end)) = 0
This should result in:
A =
0 0 4
6 0 0
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