![]() ![]() If you want to delete all columns that contain only zeros:A=A(:,any(A))įind n smallest values in a matrix and return their indices This sets the matrix to all those rows we want, we can also explicitly delete them:A(~any(A,2),:) = If you want to delete all rows that contain only zeros:A=A(any(A,2),:) Set the value at many (row,column) index pairs in a matrixĪ(sub2ind(size(A),rowIndices,columnIndices))=1 Ĭreate new matrix B where each column in A is repeated k times: ![]() OneMat = spalloc(numRows,numCols,40*numRows) % we have around at most numUsedCols = 40, each has numRows entries ![]() User some values insides the zeros function that resembles the size of your matricesįor sparse matrices, we need to approximate how much data they are likely to store Preallocate a Cell Array of Full Matrices and Sparse Matrices = ismember(queryRow,matrixToSearchIn,'rows') % check if queryRow is also a row in matrixToSearchIn Multiply a 3d matrix with a vector to get a 2d matrixĬoncatenate a cell array of matrices to one 3d matrix Assign the same matrix to all elements of a struct array ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |