lapack-gesv-big.cc (flens/examples/lapack-gesv-big.cc)

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#include <cxxstd/iostream.h>

#include <flens/flens.cxx>

using namespace std;

using namespace flens;

typedef double   T;

int

main()

{

    typedef GeMatrix<FullStorage<T> >           Matrix;

    typedef DenseVector<Array<T> >              Vector;

    typedef Matrix::IndexType                   IndexType;

    typedef DenseVector<Array<IndexType> >      IndexVector;

    const IndexType n = 4000;

    Matrix         A(n,n);

    Vector         x(n), b(n);

    IndexVector    piv(n);

    fillRandom(A);

    fillRandom(x);

    b = A*x;

    lapack::sv(A, piv, b);

    b -= x;

    cerr << "blas::asum(diff) = " << blas::asum(b) << endl;

}