MATLAB: How i can remove inf value and zero value in 10×10 Matrix

matrix manipulationupper and lower triangular matrix removal

Hi, I want to remove the highlight red data from the 10×10 matrix and also the index (i=j) which is inf.? Need your guidance. One more thing I want to extract the indices where the value is non zero?

Best Answer

I assume you want the finite values which are not zero?

 A % input Matrix
 nonZeroValues = A(A~=0 & isfinite(A));

to get the indices you can run

 ind = find(A~=0 & isfinite(A))
 [row col] = ind2sub(size(A), ind)

Related Solutions

MATLAB: How create a new matrix with values found in an another matrix

Hi Gianluca,

Have you tried using the second output from find_ndim?

[I, Imap] = find_ndim(A,3,'first');
B = A(Imap);  % The actual elements of A that were "found" above, as a vector
B = reshape(B, size(I)); % size(I) is just [m n] from your question

Basically, the elements of the variable I (output from find_ndim) are the subscript references of the 3rd dimension of A. You can also use sub2ind() to get the same result as above, you just also need the first and second subscript references:

[subs2ndDim,subsFirstDim] = meshgrid(1:size(A,2),1:size(A,1));
inds = sub2ind(size(A), subsFirstDim, subs2ndDim, I)
B = A(inds);

Hope this helped you out.

MATLAB: How to construct the 10×10 matrix

for this specific case is very easy, for other cases a little adjustment might be needed.

x=meshgrid(1:10);

Good Luck!

Best Answer

Related Solutions

MATLAB: How create a new matrix with values found in an another matrix

MATLAB: How to construct the 10×10 matrix

Related Question