Yes, we should allow users to provide their own matrix array. We use MatDensePlaceArray() to plug an array into matrix C before MatMatMult(). If we cannot do this, we will have to copy from the internal array of the result C to our array.
Would the following sequence work? MatMatMultSymbolic() MatDensePlaceArray() MatMatMultNumeric() This seems a reasonable API, but it is not obvious to users when and where MatDensePlaceArray() should be called. Currently, most users call MatMatMult(A,B, reuse,&C) instead of MatMatMultSymbolic/Numeric. We plan to add MatMatGetProduct(A,B,&C); Then, MatDensePlaceArray(C,array); Hong
