//! More...
Classes | |
class | glue_conv |
Functions | |
template<typename T1 , typename T2 > | |
static void | glue_conv::apply (Mat< typename T1::elem_type > &out, const Glue< T1, T2, glue_conv > &X) |
rudimentary implementation of the convolution operation |
//!
void glue_conv::apply | ( | Mat< typename T1::elem_type > & | out, | |
const Glue< T1, T2, glue_conv > & | X | |||
) | [inline, static, inherited] |
rudimentary implementation of the convolution operation
Definition at line 26 of file glue_conv_meat.hpp.
References Glue< T1, T2, glue_type >::A, Glue< T1, T2, glue_type >::B, Mat< eT >::is_vec(), unwrap_check< T1 >::M, Mat< eT >::memptr(), Mat< eT >::n_cols, Mat< eT >::n_elem, and Mat< eT >::set_size().
{ arma_extra_debug_sigprint(); typedef typename T1::elem_type eT; const unwrap_check<T1> A_tmp(X.A, out); const unwrap_check<T2> B_tmp(X.B, out); const Mat<eT>& A = A_tmp.M; const Mat<eT>& B = B_tmp.M; arma_debug_check( ( (A.is_vec() == false) || (B.is_vec() == false) ), "conv(): inputs must be vectors" ); arma_debug_check( ( (A.n_elem == 0 ) || (B.n_elem == 0 ) ), "conv(): zero-length input given" ); const Mat<eT>& h = (A.n_elem <= B.n_elem) ? A : B; const Mat<eT>& x = (A.n_elem <= B.n_elem) ? B : A; const u32 h_n_elem = h.n_elem; const u32 x_n_elem = x.n_elem; const u32 out_n_elem = h_n_elem + x_n_elem - 1; (A.n_cols == 1) ? out.set_size(out_n_elem, 1) : out.set_size(1, out_n_elem); const eT* h_mem = h.memptr(); const eT* x_mem = x.memptr(); eT* out_mem = out.memptr(); for(u32 out_i = 0; out_i < (h_n_elem-1); ++out_i) { eT acc = eT(0); u32 h_i = out_i; for(u32 x_i = 0; x_i <= out_i; ++x_i, --h_i) { acc += h_mem[h_i] * x_mem[x_i]; } out_mem[out_i] = acc; } for(u32 out_i = h_n_elem-1; out_i < out_n_elem - (h_n_elem-1); ++out_i) { eT acc = eT(0); u32 h_i = h_n_elem - 1; for(u32 x_i = out_i - h_n_elem + 1; x_i <= out_i; ++x_i, --h_i) { acc += h_mem[h_i] * x_mem[x_i]; } out_mem[out_i] = acc; } for(u32 out_i = out_n_elem - (h_n_elem-1); out_i < out_n_elem; ++out_i) { eT acc = eT(0); u32 h_i = h_n_elem - 1; for(u32 x_i = out_i - h_n_elem + 1; x_i < x_n_elem; ++x_i, --h_i) { acc += h_mem[h_i] * x_mem[x_i]; } out_mem[out_i] = acc; } }