Coming from C, I'm not very well versed at C++. I'm getting a compiler error which is not too descriptive. This code:

Code: Select all

#include <iostream>
#include <Eigen/Dense>

using namespace Eigen;

template <typename Derived>
void matDiv(const MatrixBase<Derived> &A) {
        MatrixBase <Derived> R;

        HouseholderQR<Derived> qr(A);

        R = qr.matrixQR().triangularView<UnitUpper>();
}


Generates this error:

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test.cc: In function ‘void matDiv(const Eigen::MatrixBase<Derived>&)’:
test.cc:12: error: expected primary-expression before ‘)’ token


Anyone know why?

Use ".template triangularView" instead of ".triangularView".
See here for the reasons why: viewtopic.php?f=74&t=96583&p=203029#p203029