docs: private void setQR(DMatrixRMaj Q , DMatrixRMaj R , int growRows ) {
          if( Q.numRows != Q.numCols ) {
              throw new IllegalArgumentException("Q should be square.");
          }
  
          this.Q = Q;
          this.R = R;
  
          m = Q.numRows;
          n = R.numCols;
  
          if( m+growRows > maxRows || n > maxCols ) {
              if( autoGrow ) {
                  declareInternalData(m+growRows,n);
              } else {
                  throw new IllegalArgumentException("Autogrow has been set to false and the maximum number of rows" +
                          " or columns has been exceeded.");
              }
          }
      }