Sets values for nrows of the matrix
Sets values for nrows of the matrix. The arrays ncols and rows are of dimension nrows and contain the number of columns in each row and the row indices, respectively. The array cols contains the column indices for each of the rows, and is ordered by rows. The data in the values array corresponds directly to the column entries in cols. The last argument is the size of the cols and values arrays, i.e. the total number of nonzeros being provided, i.e. the sum of all values in ncols. This functin erases any previous values at the specified locations and replaces them with new ones, or, if there was no value there before, inserts a new one.Not collective.
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