docs: public void declareInternalData(int maxRows, int maxCols) {
          this.maxRows = maxRows;
          this.maxCols = maxCols;
  
          U_tran = new DMatrixRMaj(maxRows,maxRows);
          Qm = new DMatrixRMaj(maxRows,maxRows);
  
          r_row = new double[ maxCols ];
      }