docs: public static boolean isIdentical(DMatrixD1 a, DMatrixD1 b , double tol ) {
          if( a.numRows != b.numRows || a.numCols != b.numCols ) {
              return false;
          }
          if( tol < 0 )
              throw new IllegalArgumentException("Tolerance must be greater than or equal to zero.");
  
          final int length = a.getNumElements();
          for( int i = 0; i < length; i++ ) {
              if( !UtilEjml.isIdentical(a.get(i),b.get(i), tol))
                  return false;
          }
  
          return true;
      }