Hello,
I have a problem:

K is a square sparse matrix (upper triangular)

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#include <Eigen\SparseCore>
#include <Eigen/Dense>
#include <Eigen/SparseCholesky>
void foo(Eigen::SparseMatrix<double> *K){
Eigen::SimplicialLLT<Eigen::SparseMatrix<double>, Eigen::Upper > solverLLt;
solverLLt.compute(*K);


the compiler says:



May you help me?

Maybe you have two conflicting installation of Eigen. Also, please check which Eigen version you are using.

I have a similar problem to the OP. I have tried using eigen 3.1.3 and 3.2beta and both the gnu and intel compilers.

Some example code:

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#include <Eigen/SparseCore>
#include <Eigen/Dense>
#include <Eigen/SparseCholesky>

typedef Eigen::SparseMatrix<float> spMat;
typedef Eigen::Triplet<float> T;

int main()
{
   spMat CM(10,10);
   std::vector<T> tripletList;
   tripletList.reserve(10);

   for (int i=0; i<10; i++){tripletList.push_back(T(i, i, log(1+pow(10.,2*(-1-i/100.))) ) ) ;}
   CM.setFromTriplets(tripletList.begin(), tripletList.end());

   Eigen::SimplicialLDLT<spMat, Eigen::Upper > chol2(CM);

   return 0.;
}

If I compile with gnu I get:

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In file included from /home/stuart/work/soft9/eigen/Eigen/SparseCholesky:26:0,
                 from test.cpp:3:
/home/stuart/work/soft9/eigen/Eigen/src/SparseCholesky/SimplicialCholesky.h: In member function ‘void Eigen::SimplicialCholeskyBase<Derived>::ordering(const MatrixType&, Eigen::SimplicialCholeskyBase<Derived>::CholMatrixType&)’:
/home/stuart/work/soft9/eigen/Eigen/src/SparseCholesky/SimplicialCholesky.h:684:5: error: ‘minimum_degree_ordering’ is not a member of ‘Eigen::internal’


whilst the intel compiler gives (specifying the -wd2196 flag to suppress some warnings) :

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/home/stuart/work/soft9/eigen/Eigen/src/SparseCholesky/SimplicialCholesky.h(684): error: namespace "Eigen::internal" has no member "minimum_degree_ordering"
      internal::minimum_degree_ordering(C, m_Pinv);
                ^
          detected during:
            instantiation of "void Eigen::SimplicialCholeskyBase<Derived>::compute<DoLDLT>(const Eigen::SimplicialCholeskyBase<Derived>::MatrixType &) [with Derived=Eigen::SimplicialLDLT<spMat, 2>, DoLDLT=true]" at line 492
            instantiation of "Eigen::SimplicialLDLT<_MatrixType, _UpLo> &Eigen::SimplicialLDLT<_MatrixType, _UpLo>::compute(const Eigen::SimplicialLDLT<_MatrixType, _UpLo>::MatrixType &) [with _MatrixType=spMat, _UpLo=2]" at line 97
            instantiation of "Eigen::SimplicialCholeskyBase<Derived>::SimplicialCholeskyBase(const Eigen::SimplicialCholeskyBase<Derived>::MatrixType &) [with Derived=Eigen::SimplicialLDLT<spMat, 2>]" at line 470
            instantiation of "Eigen::SimplicialLDLT<_MatrixType, _UpLo>::SimplicialLDLT(const Eigen::SimplicialLDLT<_MatrixType, _UpLo>::MatrixType &) [with _MatrixType=spMat, _UpLo=2]" at line 17 of "test.cpp"

compilation aborted for test.cpp (code 2)


Any help would be much appreciated, thanks.

The problem is simply a missing include in SparseCholesky. In the meantime you can simply #include <Eigen/Sparse> to fix the issue (that's also why most people never seen this problem).

for the record:

https://bitbucket.org/eigen/eigen/commits/a3c07164632c/
Changeset: a3c07164632c
User: ggael
Date: 2013-06-11 21:13:30
Summary: Add missing dependency in SparseSholesky header

https://bitbucket.org/eigen/eigen/commits/215438987fe6/
Changeset: 215438987fe6
Branch: 3.1
User: ggael
Date: 2013-06-11 21:13:30
Summary: Add missing dependency in SparseSholesky header
(transplanted from a3c07164632c3fceea8b94ae5e2be73f2d72af61)

Perfect, that's sorted it.

Many thanks.