![]() ![]() ![]() If you want to combine the indices like having odd row - odd column, and even row - even column, just compute two sets of indices, concatenate them into a single vector and do the same syntax like before. Ind = B(1:2:end, 1:2:end) %// For odd rows, odd columns - Change to suit your tastes If ki 1 or kj > 1 the MSE is either zero or it increases with the order of recursion. If you want to do this, simply pre-allocate a matrix of zeroes, then copy over those values to extract using the computed indices into the new matrix. If the absolute values of all the RCs are less than 1. ![]() I think Ill try to edit some titles and tags so these. They work in this case because p contains 4 which is the number of columns of x otherwise for p2 3 the result will only contain the first column. Now, given your comment, you want to create a new matrix that will store only these extracted matrix values while making all of the other elements zero. Here are a couple questions that are very nearly duplicates, since removing array elements is a component of the answers (although other issues are also covered): MATLAB: whats the most elegant (efficient) way to delete known elements in a matrix, matlab: delete elements from matrix. The first solution was mentioned by thewaywewalk before you and x(:,sparse(p,1,1)) and x(:,accumarray(p.,1)) dont work in general. Ind = B(1:2:end, 1:2:end) %// For odd rows, odd columns After, use the same logic above to get the actual linear indices: N = numel(A) If you want to determine the actual column major indices to access the matrix, you can generate a vector from 1 to N where N is the total number of elements in your matrix, then reshape this matrix into the desired size that you want. In this video you will learnhow to find the indices of non zero elements in a matrix in matlab,how to find the indixes of non zero elements in a matrix in ma. In MATLAB, an empty array has at least one dimension length equal to zero. It's a bit confusing as your matrix elements are the same as linear indexing values themselves. Accepted Answer: Star Strider I want to find the indices of a matrix and I am using this command. By an empty or null matrix, if we mean a matrix having all values as 0. The above assumes that you want the actual matrix values themselves. Odd rows and even columns B = A(1:2:end, 2:2:end) Įven rows and odd columns B = A(2:2:end, 1:2:end) Įven rows and even columns B = A(2:2:end, 2:2:end) It's pretty easy to do with indexing: Odd rows and odd columns B = A(1:2:end, 1:2:end) ![]()
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