docs: public static void extract( DMatrixRMaj src,
                                  int rows[] , int rowsSize ,
                                  int cols[] , int colsSize , DMatrixRMaj dst ) {
          if( rowsSize != dst.numRows || colsSize != dst.numCols )
              throw new MatrixDimensionException("Unexpected number of rows and/or columns in dst matrix");
  
          int indexDst = 0;
          for (int i = 0; i < rowsSize; i++) {
              int indexSrcRow = src.numCols*rows[i];
              for (int j = 0; j < colsSize; j++) {
                  dst.data[indexDst++] = src.data[indexSrcRow + cols[j]];
              }
          }
      }