MATLAB: Extracting matrix from a given one

extract matrix

hello I have a matrix n*n dimension, and I have a vector of indices for example ind=[3,4,6], I'd like to extract from the big matrix a small matrix formed by columns 3,4,6 and lines 3,4,6. In Matlab, if I have a matrix k(6*6), if I do k(3:6,3:6) I will obtain from lines 3 to 6 and from columns 3 to 6, but I just want lines 3,4,6 without line 5, and columns 3,4,6 without column 5.

Best Answer

Try

outputMatrix = inputMatrix(ind, ind);

Related Solutions

MATLAB: How to retrieve only positive values with indexing in matrix

ind = find(A>0);
B = [ind',A(ind)']
A =
     3     8
     4     7
     6    11
     7     4
     8     3
    11     6

MATLAB: Is it possible to extract the values with a vector of indices for each row without using the for statement from the matrix

see sub2ind()

A = [1, 2, 3; 4, 5, 6; 7, 8, 9; 10, 11, 12]; % reference matrix
b = [2; 1; 1; 3]; % index for each row that I want to extract
idx = sub2ind(size(A), 1:size(A,1), b.');
A(idx)

Result

>> A(idx)
ans =
     2     4     7    12

Best Answer

Related Solutions

MATLAB: How to retrieve only positive values with indexing in matrix

MATLAB: Is it possible to extract the values with a vector of indices for each row without using the for statement from the matrix

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