docs: public static void elementMult( DMatrixSparseCSC A, DMatrixSparseCSC B, DMatrixSparseCSC C ,
                                      @Nullable IGrowArray gw, @Nullable DGrowArray gx) {
          if( A.numCols != B.numCols || A.numRows != B.numRows )
              throw new MatrixDimensionException("All inputs must have the same number of rows and columns. "+stringShapes(A,B));
          C.reshape(A.numRows,A.numCols);
  
          ImplCommonOps_DSCC.elementMult(A,B,C,gw,gx);
      }