CODEWITHSUNDEEP
c++eigen
Aman Deep Gautam
Aman Deep Gautam

Reputation: 8747

EigenvalueType’ in namespace ‘Eigen’ does not name a type

I am using eigen library for a finding eigevalues and eigenvectors. From this webpage the following definition-:

const EigenvalueType & eigenvalues () const;

Hence I am using a statement like

const Eigen::EigenvalueType &value = solver.eigenvalues()

The following files have been included:

#include "Eigen/Core"
#include "unsupported/Eigen/MatrixFunctions"
#include "Eigen/Eigenvalues"

I also checked the source code of the file containing the typedef for EigenValueType and included it too with statement:

#include "Eigen/src/Eigenvalues/EigenSolver.h"

But still I am getting the following error at compile time.

error: ‘EigenvalueType’ in namespace ‘Eigen’ does not name a type

I do not understand why it is not able to recognize the typedef's. Any help appreciated.

Upvotes: 2

Views: 5777

Answers (1)

billz
billz

Reputation: 45410

EigenvalueType is a typedef declared inside class EigenSolver, you need to use it like

  Eigen::EigenSolver<Eigen::MatrixXd>::EigenvalueType &value = solver.eigenvalues()
//^^^^^^^^^^^

Upvotes: 4

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