15-numcxx-umfpack.cxx File Reference

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Functions
int	main (void)

Function Documentation

int main

(

void

)

Examples:

15-numcxx-umfpack.cxx.

Definition at line 14 of file 15-numcxx-umfpack.cxx.

{
    int n=5000;
    numcxx::DSparseMatrix A(n,n);
    numcxx::DArray1 U(n);
    numcxx::DArray1 F(n);
    
    F=1.0;
    for (int i=0;i<n;i++)
    {
        A(i,i)=3.0;
        if (i>0) A(i,i-1)=-1;
        if (i<n-1) A(i,i+1)=-1;
    }
    A.flush();
    
    numcxx::DSolverUMFPACK UmfpackSolver(A);
    UmfpackSolver.update(A);
    UmfpackSolver.solve(U,F);
    double residual=normi(A*U-F);
    
    std::cout << "residual:" << residual << std::endl;
}

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