Hi,

I am trying to transform each element of matrix A using a function f.
Is this the efficient way to do so?

Code: Select all

A = A.unaryExpr(ptr_fun(f)) ;

When reading Eigen documentation, I am also confused by unaryExpr unaryViewExpr?
(as in this page: http://eigen.tuxfamily.org/dox-devel/classEigen_1_1MatrixBase.html#a2be175e189ac4baa01736f9a4c5a9bc4)
What are the difference scenarios of using them respectively?

Thanks.

yes, your syntax is good. The operator f will be applied in-place. unaryViewExpr is for read/write operators, i.e., the functor must return a reference. It is used for instance to implement real() and imag().