code: public static void insert(DMatrix src, DMatrix dest, int destY0, int destX0) {
          extract(src, 0, src.getNumRows(), 0, src.getNumCols(), dest, destY0, destX0);
      }
docs: Inserts matrix 'src' into matrix 'dest' with the (0,0) of src at (row,col) in dest.
  This is equivalent to calling extract(src,0,src.numRows,0,src.numCols,dest,destY0,destX0).
  
  @param src matrix that is being copied into dest. Not modified.
  @param dest Where src is being copied into. Modified.
  @param destY0 Start row for the copy into dest.
  @param destX0 Start column for the copy into dest.