I am trying to use the Armadillo matrix library to do matrix calculations and

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Asked: May 13, 20262026-05-13T19:34:01+00:00 2026-05-13T19:34:01+00:00

I am trying to use the Armadillo matrix library to do matrix calculations and

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I am trying to use the Armadillo matrix library to do matrix calculations and it needs BLAS and LAPACK. The Armadillo documentation recommended getting the precompiled versions from http://www.stanford.edu/~vkl/code/libs.html

There are .lib and .dll files in there. The only problem is I don’t know how to get Visual Studio (Express Edition 2008) to recognize these files. I try to copy them to the Visual C++ include and lib directories C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\include\ and C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\lib\, but it doesn’t seem to do anything because when I try to compile my program, I get lots of "unresolved external symbol" errors that say it can’t find LAPACK functions.

Here are the error messages:

1>Linking...
1>LINK : warning LNK4076: invalid incremental status file 'C:\Users\User\Documents\Visual Studio 2008\Projects\TentPitcher\Debug\TentPitcher.ilk'; linking nonincrementally
1>   Creating library C:\Users\User\Documents\Visual Studio 2008\Projects\TentPitcher\Debug\TentPitcher.lib and object C:\Users\User\Documents\Visual Studio 2008\Projects\TentPitcher\Debug\TentPitcher.exp
1>Cell3DXT.obj : error LNK2019: unresolved external symbol _zgetrf_ referenced in function "void __cdecl arma::lapack::getrf_<double>(int *,int *,double *,int *,int *,int *)" (??$getrf_@N@lapack@arma@@YAXPAH0PAN000@Z)
1>ThreeCell3DXT.obj : error LNK2001: unresolved external symbol _zgetrf_
1>Cell3DXT.obj : error LNK2019: unresolved external symbol _cgetrf_ referenced in function "void __cdecl arma::lapack::getrf_<double>(int *,int *,double *,int *,int *,int *)" (??$getrf_@N@lapack@arma@@YAXPAH0PAN000@Z)
1>ThreeCell3DXT.obj : error LNK2001: unresolved external symbol _cgetrf_
1>Cell3DXT.obj : error LNK2019: unresolved external symbol _dgetrf_ referenced in function "void __cdecl arma::lapack::getrf_<double>(int *,int *,double *,int *,int *,int *)" (??$getrf_@N@lapack@arma@@YAXPAH0PAN000@Z)
1>ThreeCell3DXT.obj : error LNK2001: unresolved external symbol _dgetrf_
1>Cell3DXT.obj : error LNK2019: unresolved external symbol _sgetrf_ referenced in function "void __cdecl arma::lapack::getrf_<double>(int *,int *,double *,int *,int *,int *)" (??$getrf_@N@lapack@arma@@YAXPAH0PAN000@Z)
1>ThreeCell3DXT.obj : error LNK2001: unresolved external symbol _sgetrf_
1>Cell3DXT.obj : error LNK2019: unresolved external symbol _zgemv_ referenced in function "void __cdecl arma::blas::gemv_<double>(char const *,int const *,int const *,double const *,double const *,int const *,double const *,int const *,double const *,double *,int const *)" (??$gemv_@N@blas@arma@@YAXPBDPBH1PBN21212PAN1@Z)
1>ThreeCell3DXT.obj : error LNK2001: unresolved external symbol _zgemv_
1>TwoCell3DXT.obj : error LNK2001: unresolved external symbol _zgemv_
1>Cell3DXT.obj : error LNK2019: unresolved external symbol _cgemv_ referenced in function "void __cdecl arma::blas::gemv_<double>(char const *,int const *,int const *,double const *,double const *,int const *,double const *,int const *,double const *,double *,int const *)" (??$gemv_@N@blas@arma@@YAXPBDPBH1PBN21212PAN1@Z)
1>ThreeCell3DXT.obj : error LNK2001: unresolved external symbol _cgemv_
1>TwoCell3DXT.obj : error LNK2001: unresolved external symbol _cgemv_
1>Cell3DXT.obj : error LNK2019: unresolved external symbol _dgemv_ referenced in function "void __cdecl arma::blas::gemv_<double>(char const *,int const *,int const *,double const *,double const *,int const *,double const *,int const *,double const *,double *,int const *)" (??$gemv_@N@blas@arma@@YAXPBDPBH1PBN21212PAN1@Z)
1>ThreeCell3DXT.obj : error LNK2001: unresolved external symbol _dgemv_
1>TwoCell3DXT.obj : error LNK2001: unresolved external symbol _dgemv_
1>Cell3DXT.obj : error LNK2019: unresolved external symbol _sgemv_ referenced in function "void __cdecl arma::blas::gemv_<double>(char const *,int const *,int const *,double const *,double const *,int const *,double const *,int const *,double const *,double *,int const *)" (??$gemv_@N@blas@arma@@YAXPBDPBH1PBN21212PAN1@Z)
1>ThreeCell3DXT.obj : error LNK2001: unresolved external symbol _sgemv_
1>TwoCell3DXT.obj : error LNK2001: unresolved external symbol _sgemv_
1>Cell3DXT.obj : error LNK2019: unresolved external symbol _zgemm_ referenced in function "void __cdecl arma::blas::gemm_<double>(char const *,char const *,int const *,int const *,int const *,double const *,double const *,int const *,double const *,int const *,double const *,double *,int const *)" (??$gemm_@N@blas@arma@@YAXPBD0PBH11PBN21212PAN1@Z)
1>ThreeCell3DXT.obj : error LNK2001: unresolved external symbol _zgemm_
1>TwoCell3DXT.obj : error LNK2001: unresolved external symbol _zgemm_
1>Cell3DXT.obj : error LNK2019: unresolved external symbol _cgemm_ referenced in function "void __cdecl arma::blas::gemm_<double>(char const *,char const *,int const *,int const *,int const *,double const *,double const *,int const *,double const *,int const *,double const *,double *,int const *)" (??$gemm_@N@blas@arma@@YAXPBD0PBH11PBN21212PAN1@Z)
1>ThreeCell3DXT.obj : error LNK2001: unresolved external symbol _cgemm_
1>TwoCell3DXT.obj : error LNK2001: unresolved external symbol _cgemm_
1>Cell3DXT.obj : error LNK2019: unresolved external symbol _dgemm_ referenced in function "void __cdecl arma::blas::gemm_<double>(char const *,char const *,int const *,int const *,int const *,double const *,double const *,int const *,double const *,int const *,double const *,double *,int const *)" (??$gemm_@N@blas@arma@@YAXPBD0PBH11PBN21212PAN1@Z)
1>ThreeCell3DXT.obj : error LNK2001: unresolved external symbol _dgemm_
1>TwoCell3DXT.obj : error LNK2001: unresolved external symbol _dgemm_
1>Cell3DXT.obj : error LNK2019: unresolved external symbol _sgemm_ referenced in function "void __cdecl arma::blas::gemm_<double>(char const *,char const *,int const *,int const *,int const *,double const *,double const *,int const *,double const *,int const *,double const *,double *,int const *)" (??$gemm_@N@blas@arma@@YAXPBD0PBH11PBN21212PAN1@Z)
1>ThreeCell3DXT.obj : error LNK2001: unresolved external symbol _sgemm_
1>TwoCell3DXT.obj : error LNK2001: unresolved external symbol _sgemm_
1>Cell3DXT.obj : error LNK2019: unresolved external symbol _zgetri_ referenced in function "void __cdecl arma::lapack::getri_<double>(int *,double *,int *,int *,double *,int *,int *)" (??$getri_@N@lapack@arma@@YAXPAHPAN00100@Z)
1>ThreeCell3DXT.obj : error LNK2001: unresolved external symbol _zgetri_
1>Cell3DXT.obj : error LNK2019: unresolved external symbol _cgetri_ referenced in function "void __cdecl arma::lapack::getri_<double>(int *,double *,int *,int *,double *,int *,int *)" (??$getri_@N@lapack@arma@@YAXPAHPAN00100@Z)
1>ThreeCell3DXT.obj : error LNK2001: unresolved external symbol _cgetri_
1>Cell3DXT.obj : error LNK2019: unresolved external symbol _dgetri_ referenced in function "void __cdecl arma::lapack::getri_<double>(int *,double *,int *,int *,double *,int *,int *)" (??$getri_@N@lapack@arma@@YAXPAHPAN00100@Z)
1>ThreeCell3DXT.obj : error LNK2001: unresolved external symbol _dgetri_
1>Cell3DXT.obj : error LNK2019: unresolved external symbol _sgetri_ referenced in function "void __cdecl arma::lapack::getri_<double>(int *,double *,int *,int *,double *,int *,int *)" (??$getri_@N@lapack@arma@@YAXPAHPAN00100@Z)
1>ThreeCell3DXT.obj : error LNK2001: unresolved external symbol _sgetri_
1>TwoCell3DXT.obj : error LNK2019: unresolved external symbol _dgesvd_ referenced in function "void __cdecl arma::lapack::gesvd_<double>(char *,char *,int *,int *,double *,int *,double *,double *,int *,double *,int *,double *,int *,int *)" (??$gesvd_@N@lapack@arma@@YAXPAD0PAH1PAN122121211@Z)
1>TwoCell3DXT.obj : error LNK2019: unresolved external symbol _sgesvd_ referenced in function "void __cdecl arma::lapack::gesvd_<double>(char *,char *,int *,int *,double *,int *,double *,double *,int *,double *,int *,double *,int *,int *)" (??$gesvd_@N@lapack@arma@@YAXPAD0PAH1PAN122121211@Z)
1>C:\Users\User\Documents\Visual Studio 2008\Projects\TentPitcher\Debug\TentPitcher.exe : fatal error LNK1120: 18 unresolved externals
1>Build log was saved at "file://c:\Users\User\Documents\Visual Studio 2008\Projects\TentPitcher\TentPitcher\Debug\BuildLog.htm"
1>TentPitcher - 43 error(s), 1 warning(s)

"Cell3DXT", "TwoCell3DXT", and "ThreeCell3DXT" are classes in my own code. Also in the LAPACK and BLAS files above, there are ".exp files" – what are those and do those have something to do with the problem?

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1 Answer

Editorial Team · Answer 1 · 2026-05-13T19:34:02+00:00

Editorial Team

2026-05-13T19:34:02+00:00Added an answer on May 13, 2026 at 7:34 pm

I figured out the answer to my problem. The problem was that I knew I had to put the directory containing the LAPACK .lib file in the list of library directories (Tools -> Options -> Projects and Solutions -> VC++ Directories -> Library Files) but forgot that I also had to add it to the “Additional Dependencies” under Project -> (Project Name) Properties -> Linker -> Input.

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