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jiri 2005-09-05 14:19:44 +00:00
parent c6683e789d
commit 4e5311fece
1 changed files with 10 additions and 7 deletions
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17
nonclass.h
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@ -119,22 +119,25 @@ linear_solve(a,NULL,&det);
return det;
}
//general submatrix
//general submatrix, INDEX will typically be NRVec<int> or even int*
//NOTE: in order to check consistency between nrows and rows in rows is a NRVec
//some advanced metaprogramming would be necessary
template<class MAT, class INDEX>
const NRMat<typename LA_traits<MAT>::elementtype> submatrix(const MAT a, const INDEX rows, const INDEX cols, int indexshift=0, bool ignoresign=false)
const NRMat<typename LA_traits<MAT>::elementtype> submatrix(const MAT a, const int nrows, const INDEX rows, const int ncols, const INDEX cols, int indexshift=0, bool ignoresign=false)
{
NRMat<typename LA_traits<MAT>::elementtype> r(rows.size(),cols.size());
NRMat<typename LA_traits<MAT>::elementtype> r(nrows,ncols);
if(ignoresign)
{
for(int i=0; i<rows.size(); ++i)
for(j=0; j<cols.size(); ++j)
for(int i=0; i<nrows; ++i)
for(int j=0; j<ncols; ++j)
r(i,j) = a(abs(rows[i])+indexshift,abs(cols[j])+indexshift);
}
else
{
for(int i=0; i<rows.size(); ++i)
for(j=0; j<cols.size(); ++j)
for(int i=0; i<nrows; ++i)
for(int j=0; j<ncols; ++j)
r(i,j) = a(rows[i]+indexshift,cols[j]+indexshift);
}