If I have a templated function that accepts a parameter of Eigen::DenseBase<Derived>& matrix, is there a way to iterate over the entries of the DenseBase matrix in a way that respects the storage order? I see an innerSize and an outerSize method to get the sizes of each, but no way to actually get the values, e.g., I would like to do something like:

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for( int outer = 0; outer < matrix.outerSize(); ++outer )
{
  for( int inner = 0; inner < matrix.innerSize(); ++inner )
  {
    matrix.getValueAtOuterInner( outer, inner ) = generateSomeValue();
  }
}

Does some equivalent of getValueAtOuterInner exist, or should I perform this iteration in some other fashion?

Thank you!

... edited to fixe typo

here it is: mat.coeffByOuterInner(o,i)

Thank you! Is there a non-const version? I suppose I can use

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matrix(matrix.rowIndexByOuterInner(o,i ),matrix.colIndexByOuterInner(o,i))

but that feels a bit verbose.

yes, coeffRefByOuterInner. They are the respective versions of the .coeff() and .coeffRef() methods.