void
computeSV(flens::GeMatrix<flens::FullStorage<T, cxxblas::ColMajor> > &A, T &cB, T &CB) {
flens::GeMatrix<flens::FullStorage<T, cxxblas::ColMajor> > U(A.numRows(),A.numRows()),
V(A.numCols(),A.numCols());
DenseVector<Array<T> > s(A.numCols());
int iterations = svd(A,s,U,V);
CB = s(s.firstIndex());
cB = s(s.lastIndex());
}
void
computeEV(flens::GeMatrix<flens::FullStorage<T, cxxblas::ColMajor> > &A, T &cB, T &CB) {
flens::GeMatrix<flens::FullStorage<T, cxxblas::ColMajor> > U(A.numRows(),A.numRows()),
V(A.numCols(),A.numCols());
int N = A.numRows();
DenseVector<Array<T> > wr(N), wi(N);
flens::GeMatrix<flens::FullStorage<T, cxxblas::ColMajor> > vl,vr;
ev(false, false, A, wr, wi, vl, vr);
cB=wr(wr.firstIndex()), CB=wr(wr.lastIndex());
for (int i=1; i<=wr.lastIndex(); ++i) {
cB = std::min(cB,wr(i));
CB = std::max(CB,wr(i));
}
}
void TriangleInvert(flens::GeMatrix<FS> &A, flens::DenseVector<flens::Array<int> > &p)
{
assert(A.numRows()==A.numCols());
int info = flens::tri(A, p);
if (info != 0) {
std::ostringstream oss;
if (info < 0) {
oss << "Internal FLENS/Lapack error: Error in argument " << -info
<< " of xxtri call.";
}
else { // info > 0
oss << "Error in triangle inversion: The matrix is singular with its " << info
<< " diagonal element exactly equal to zero.";
}
throw Exception(oss.str());
}
}
void
read(flens::GeMatrix<flens::FullStorage<ElementType> > &GeMatrix, std::string filename)
{
typedef int IndexType;
IndexType j,k;
FILE * in;
// Format check
std::string format;
if ((typeid(ElementType)==typeid(int))
|| (typeid(ElementType)==typeid(unsigned int))
|| (typeid(ElementType)==typeid(long int))
|| (typeid(ElementType)==typeid(long unsigned int))) format = "%d";
else format = "%lf";
if( (in = fopen(filename.c_str(),"r")) ==NULL)
{
perror("read: ");
return;
}
if (fscanf(in,"%d %d",&j, &k)==0)
{
GeMatrix.resize(0,0);
}
else
{
GeMatrix.resize(j,k);
for(IndexType r=1; r<=GeMatrix.numRows(); ++r)
{
for(IndexType c=1; c<=GeMatrix.numCols(); ++c)
{
fscanf(in, format.c_str(), &GeMatrix(r,c));
}
}
}
};
