// tri_lhs = tri_rhs
void DenseLinAlgPack::assign(DMatrixSliceTriEle* tri_lhs, const DMatrixSliceTriEle& tri_rhs)
{
assert_gms_lhs(tri_lhs->gms(),tri_rhs.gms().rows(),tri_rhs.gms().cols(),BLAS_Cpp::no_trans);
switch(tri_lhs->gms().overlap(tri_rhs.gms())) {
case SAME_MEM:
if(tri_lhs->uplo() == tri_rhs.uplo()) return; // Assignment to self to exit
case SOME_OVERLAP:
// Test for the special case where the upper tri region (above diagonal) of a
// matrix is being copied into the BLAS_Cpp::lower tri region (below the diagonal) of
// the same matrix or visa-versa. No temp is need in this case
if(tri_lhs->uplo() != tri_rhs.uplo()) {
const DMatrixSlice *up = (tri_lhs->uplo() == upper)
? &tri_lhs->gms() : &tri_rhs.gms();
const DMatrixSlice *lo = (tri_rhs.uplo() == BLAS_Cpp::lower)
? &tri_lhs->gms() : &tri_rhs.gms();
if(lo->col_ptr(1) + lo->max_rows() - 1 == up->col_ptr(1)) { // false if SAME_MEM
// One triangular region is being copied into another so no temp needed.
i_assign_basic(tri_lhs, tri_rhs);
return;
}
}
// Give up and copy the vs_rhs as a temp.
{
DMatrix temp(tri_rhs.gms());
i_assign_basic(tri_lhs, tri_ele(temp(),tri_rhs.uplo()));
return;
}
case NO_OVERLAP: // no overlap so just perform the copy
i_assign_basic(tri_lhs, tri_rhs);
return;
}
}
bool DenseLinAlgPack::comp(const DMatrixSliceTriEle& tri_gms1, value_type alpha)
{
using BLAS_Cpp::bool_to_trans;
BLAS_Cpp::Transp
trans1 = bool_to_trans(tri_gms1.uplo() != BLAS_Cpp::lower);
const size_type n = tri_gms1.rows(); // same as cols()
for(size_type i = 1; i < n; ++i) {
if( !comp( col(tri_gms1.gms(),trans1,i)(i,n), alpha ) )
return false;
}
return true;
}
void DenseLinAlgPack::Mp_StM(DMatrixSliceTriEle* tri_lhs, value_type alpha, const DMatrixSliceTriEle& tri_ele_rhs)
{
Mp_M_assert_sizes(tri_lhs->gms().rows(), tri_lhs->gms().cols(), BLAS_Cpp::no_trans
, tri_ele_rhs.gms().rows(), tri_ele_rhs.gms().cols(), BLAS_Cpp::no_trans);
BLAS_Cpp::Transp
trans_lhs = (tri_lhs->uplo() == BLAS_Cpp::lower) ? BLAS_Cpp::no_trans : BLAS_Cpp::trans,
trans_rhs = (tri_ele_rhs.uplo() == BLAS_Cpp::lower) ? BLAS_Cpp::no_trans : BLAS_Cpp::trans;
DMatrixSlice::size_type n = tri_lhs->gms().cols();
for(DMatrixSlice::size_type j = 1; j <= n; ++j)
Vp_StV( &col(tri_lhs->gms(),trans_lhs,j)(j,n), alpha, col(tri_ele_rhs.gms(),trans_rhs,j)(j,n) );
}