| Re: [eigen] Compiler error with stableNorm |
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Wow, that was fast. Thanks!
On 12/15/2017 03:17 PM, Gael Guennebaud wrote:
> thank you for the report,
>
> fixed:
> https://bitbucket.org/eigen/eigen/commits/c2947c341c68/
> https://bitbucket.org/eigen/eigen/commits/499e982b9281/
>
> you can either update to the head of 3.3, or workaround by evaluating the subexpression:
> (s*v).eval().stableNorm().
>
> cheers,
> gael
>
> On Fri, Dec 15, 2017 at 2:51 PM, Claas H. Köhler <claas.koehler@xxxxxx <mailto:claas.koehler@xxxxxx>>
> wrote:
>
> Hi,
>
> When compiling the code below, I get a compiler error (using gcc-7 on openSuse 13.2). The code
> compiles fine when replacing stableNorm by blueNorm. Is this intendend ?
>
> Here is a minimal example reproducing the issue:
> #include <complex>
> #include <iostream>
> #include <Eigen/Core>
>
> int main(void){
> typedef std::complex<double> Scalar;
> typedef typename Eigen::NumTraits<Scalar>::Real RealScalar;
> typedef Eigen::Matrix<Scalar, Eigen::Dynamic, 1> Vector;
> typedef Eigen::Matrix<RealScalar, Eigen::Dynamic, 1> RealVector;
>
> Vector v;
> Scalar s;
>
> std::cout << (s*v).stableNorm() <<std::endl;
>
> return 0;
> }
>
> The following error message seems to indicate the main problem:
>
> eigen/3.3.4/include/eigen3/Eigen/src/Core/StableNorm.h:187:34:
> error: no matching function for call to ‘Eigen::VectorBlock<const Eigen::Matrix<std::complex<double>,
> -1, 1>, -1>::VectorBlock(Eigen::DenseBase<Eigen::Matrix<std::complex<double>, -1, 1>
> >::SegmentReturnType)’
> internal::stable_norm_kernel(SegmentWrapper(copy.segment(bi,numext::mini(blockSize, n - bi))),
> ssq, scale, invScale);
> eigen3/Eigen/src/Core/VectorBlock.h:56:47: note:
> no known conversion for argument 1 from ‘Eigen::DenseBase<Eigen::Matrix<std::complex<double>, -1, 1>
> >::SegmentReturnType {aka Eigen::VectorBlock<Eigen::Matrix<std::complex<double>, -1, 1>, -1>}’ to
> ‘const Eigen::VectorBlock<const Eigen::Matrix<std::complex<double>, -1, 1>, -1>&’
>
> eigen/3.3.4/include/eigen3/Eigen/src/Core/VectorBlock.h:56:47: note: candidate:
> Eigen::VectorBlock<const Eigen::Matrix<std::complex<double>, -1, 1>,
> -1>::VectorBlock(Eigen::VectorBlock<const Eigen::Matrix<std::complex<double>, -1, 1>, -1>&&)
> /home/opairs01/tools/eigen/3.3.4/include/eigen3/Eigen/src/Core/VectorBlock.h:56:47:
> note: no known conversion for argument 1 from
> ‘Eigen::DenseBase<Eigen::Matrix<std::complex<double>, -1, 1> >::SegmentReturnType {aka
> Eigen::VectorBlock<Eigen::Matrix<std::complex<double>, -1, 1>, -1>}’ to ‘Eigen::VectorBlock<const
> Eigen::Matrix<std::complex<double>, -1, 1>, -1>&&’
>
>
> Any help would be appreciated.
>
> Regards
> Claas
>
>
>
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