//! More...
Classes | |
class | op_inv |
'invert matrix' operation More... | |
Functions | |
template<typename eT > | |
static void | op_inv::apply (Mat< eT > &out, const Mat< eT > &A) |
immediate inverse of a matrix, storing the result in a dense matrix | |
template<typename T1 > | |
static void | op_inv::apply (Mat< typename T1::elem_type > &out, const Op< T1, op_inv > &in) |
immediate inverse of T1, storing the result in a dense matrix | |
template<typename T1 > | |
static void | op_inv::apply_diag (Mat< typename T1::elem_type > &out, const Base< typename T1::elem_type, T1 > &X) |
//!
void op_inv::apply | ( | Mat< eT > & | out, | |
const Mat< eT > & | A | |||
) | [inline, static, inherited] |
immediate inverse of a matrix, storing the result in a dense matrix
Definition at line 25 of file op_inv_meat.hpp.
References arma_warn(), auxlib::inv_inplace(), auxlib::inv_noalias(), Mat< eT >::is_square(), and Mat< eT >::set_size().
Referenced by apply().
{ arma_extra_debug_sigprint(); // no need to check for aliasing, due to: // - auxlib::inv() copies A to out before inversion // - for 2x2 and 3x3 matrices the code is alias safe arma_debug_check( !A.is_square(), "op_inv::apply(): matrix must be square" ); const bool status = (&out != &A) ? auxlib::inv_noalias(out, A) : auxlib::inv_inplace(out); if(status == false) { arma_warn( true, "inv(): matrix appears to be singular" ); out.set_size(0,0); } }
void op_inv::apply | ( | Mat< typename T1::elem_type > & | out, | |
const Op< T1, op_inv > & | in | |||
) | [inline, static, inherited] |
immediate inverse of T1, storing the result in a dense matrix
Definition at line 50 of file op_inv_meat.hpp.
References apply(), apply_diag(), strip_diagmat< T1 >::do_diagmat, unwrap< T1 >::M, strip_diagmat< T1 >::M, and Op< T1, op_type >::m.
{ arma_extra_debug_sigprint(); typedef typename T1::elem_type eT; const strip_diagmat<T1> strip(X.m); if(strip.do_diagmat == true) { op_inv::apply_diag(out, strip.M); } else { const unwrap<T1> tmp(X.m); const Mat<eT>& A = tmp.M; op_inv::apply(out, A); } }
void op_inv::apply_diag | ( | Mat< typename T1::elem_type > & | out, | |
const Base< typename T1::elem_type, T1 > & | X | |||
) | [inline, static, inherited] |
Definition at line 76 of file op_inv_meat.hpp.
References Mat< eT >::at(), Base< elem_type, derived >::get_ref(), and Mat< eT >::set_size().
Referenced by apply().
{ arma_extra_debug_sigprint(); typedef typename T1::elem_type eT; const diagmat_proxy_check<T1> A(X.get_ref(), out); const u32 N = A.n_elem; out.set_size(N,N); for(u32 col=0; col<N; ++col) { for(u32 row=0; row<col; ++row) { out.at(row,col) = eT(0); } out.at(col,col) = eT(1) / A[col]; for(u32 row=col+1; row<N; ++row) { out.at(row,col) = eT(0); } } }