[CppAD] Using eigenvalues from Eigen in CppAD with Ipopt

[Jyotiranjan Beuria]

Dear All,

I am trying to use CppAD along with Ipopt. However, my function
depends on eigenvalues and for that I am trying to use Eigen.

A snippet of the code for a simple case is as follows:










*          AD<double> x1 = x[0];            MatrixXd m(2,2);
m(0,0)=x1*x1;          m(0,1)= x1;          m(1,0)= 1.0;          m(1,1)=
x1+x1*x1-1.0;          EigenSolver<MatrixXd> es(m);          AD<double>
y=es.eigenvalues();          // f(x)          fg[0] = y[0]+y[1];  *

I get following error.

*error: cannot convert ‘CppAD::AD<double>’ to
‘Eigen::DenseCoeffsBase<Eigen:*








*:Matrix<double, -1, -1>, 1>::Scalar {aka double}’ in
assignmentmyTest.cpp:31:36: error: conversion from ‘const EigenvalueType
{aka const Eigen::Matrix<std::complex<double>, -1, 1>}’ to non-scalar type
‘CppAD::AD<double>’ requested       AD<double>
y=es.eigenvalues();                                    ^myTest.cpp:33:15:
error: no match for call to ‘(CppAD::AD<double>) (int)’    fg[0] =
y(0)+y(1);*
Can anyone help?

Regards,
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://list.coin-or.org/pipermail/cppad/attachments/20170521/82acf867/attachment.html>