//! More...
Classes | |
class | op_min |
Class for finding minimum values in a matrix. More... | |
Functions | |
template<typename eT > | |
static eT | op_min::direct_min (const eT *const X, const u32 N) |
Find the minimum value in an array. | |
template<typename eT > | |
static eT | op_min::direct_min (const subview< eT > &X) |
find the minimum value in a subview | |
template<typename eT > | |
static eT | op_min::direct_min (const diagview< eT > &X) |
find the minimum value in a diagview | |
template<typename T1 > | |
static void | op_min::apply (Mat< typename T1::elem_type > &out, const Op< T1, op_min > &in) |
//! For each row or for each column, find the minimum value. //! The result is stored in a dense matrix that has either one column or one row. //! The dimension, for which the minima are found, is set via the min() function. | |
template<typename T > | |
static std::complex< T > | op_min::direct_min (const std::complex< T > *const X, const u32 n_elem) |
Find the minimum value in an array (version for complex numbers). | |
template<typename T > | |
static std::complex< T > | op_min::direct_min (const subview< std::complex< T > > &X) |
Find the minimum value in a subview (version for complex numbers). | |
template<typename T > | |
static std::complex< T > | op_min::direct_min (const diagview< std::complex< T > > &X) |
Find the minimum value in a diagview (version for complex numbers). | |
template<typename T , typename T1 > | |
static void | op_min::apply (Mat< std::complex< T > > &out, const Op< T1, op_min > &in) |
Implementation for complex numbers. |
//!
eT op_min::direct_min | ( | const eT *const | X, | |
const u32 | N | |||
) | [inline, static, inherited] |
Find the minimum value in an array.
Definition at line 25 of file op_min_meat.hpp.
Referenced by apply(), and min().
{ arma_extra_debug_sigprint(); eT min_val = X[0]; for(u32 i=1; i<n_elem; ++i) { const eT tmp_val = X[i]; if(tmp_val < min_val) { min_val = tmp_val; } } return min_val; }
eT op_min::direct_min | ( | const subview< eT > & | X | ) | [inline, static, inherited] |
find the minimum value in a subview
Definition at line 50 of file op_min_meat.hpp.
References subview< eT >::n_elem.
eT op_min::direct_min | ( | const diagview< eT > & | X | ) | [inline, static, inherited] |
find the minimum value in a diagview
Definition at line 75 of file op_min_meat.hpp.
References diagview< eT >::n_elem.
void op_min::apply | ( | Mat< typename T1::elem_type > & | out, | |
const Op< T1, op_min > & | in | |||
) | [inline, static, inherited] |
//! For each row or for each column, find the minimum value. //! The result is stored in a dense matrix that has either one column or one row. //! The dimension, for which the minima are found, is set via the min() function.
Definition at line 101 of file op_min_meat.hpp.
References Mat< eT >::at(), Op< T1, op_type >::aux_u32_a, Mat< eT >::colptr(), direct_min(), unwrap_check< T1 >::M, Op< T1, op_type >::m, Mat< eT >::n_cols, Mat< eT >::n_elem, Mat< eT >::n_rows, and Mat< eT >::set_size().
{ arma_extra_debug_sigprint(); typedef typename T1::elem_type eT; const unwrap_check<T1> tmp(in.m, out); const Mat<eT>& X = tmp.M; arma_debug_check( (X.n_elem == 0), "min(): given matrix has no elements" ); const u32 dim = in.aux_u32_a; arma_debug_check( (dim > 1), "min(): incorrect usage. dim must be 0 or 1"); if(dim == 0) // column-wise min { arma_extra_debug_print("op_min::apply(), dim = 0"); out.set_size(1, X.n_cols); for(u32 col=0; col<X.n_cols; ++col) { out[col] = op_min::direct_min( X.colptr(col), X.n_rows ); } } else if(dim == 1) // row-wise min { arma_extra_debug_print("op_min::apply(), dim = 1"); out.set_size(X.n_rows, 1); for(u32 row=0; row<X.n_rows; ++row) { eT min_val = X.at(row,0); for(u32 col=1; col<X.n_cols; ++col) { const eT tmp_val = X.at(row,col); if(tmp_val < min_val) { min_val = tmp_val; } } out[row] = min_val; } } }
std::complex< T > op_min::direct_min | ( | const std::complex< T > *const | X, | |
const u32 | n_elem | |||
) | [inline, static, inherited] |
Find the minimum value in an array (version for complex numbers).
Definition at line 162 of file op_min_meat.hpp.
References abs().
std::complex< T > op_min::direct_min | ( | const subview< std::complex< T > > & | X | ) | [inline, static, inherited] |
Find the minimum value in a subview (version for complex numbers).
Definition at line 189 of file op_min_meat.hpp.
References abs().
std::complex< T > op_min::direct_min | ( | const diagview< std::complex< T > > & | X | ) | [inline, static, inherited] |
Find the minimum value in a diagview (version for complex numbers).
Definition at line 216 of file op_min_meat.hpp.
References abs().
void op_min::apply | ( | Mat< std::complex< T > > & | out, | |
const Op< T1, op_min > & | in | |||
) | [inline, static, inherited] |
Implementation for complex numbers.
Definition at line 241 of file op_min_meat.hpp.
References abs(), Mat< eT >::at(), Op< T1, op_type >::aux_u32_a, Mat< eT >::colptr(), direct_min(), unwrap_check< T1 >::M, Op< T1, op_type >::m, Mat< eT >::n_cols, Mat< eT >::n_elem, and Mat< eT >::n_rows.
{ arma_extra_debug_sigprint(); typedef typename std::complex<T> eT; isnt_same_type<eT, typename T1::elem_type>::check(); const unwrap_check<T1> tmp(in.m, out); const Mat<eT>& X = tmp.M; arma_debug_check( (X.n_elem == 0), "min(): given matrix has no elements" ); const u32 dim = in.aux_u32_a; arma_debug_check( (dim > 1), "min(): incorrect usage. dim must be 0 or 1"); if(dim == 0) // column-wise min { arma_extra_debug_print("op_min::apply(), dim = 0"); out.set_size(1, X.n_cols); for(u32 col=0; col<X.n_cols; ++col) { out[col] = op_min::direct_min( X.colptr(col), X.n_rows ); } } else if(dim == 1) // row-wise min { arma_extra_debug_print("op_min::apply(), dim = 1"); out.set_size(X.n_rows, 1); for(u32 row=0; row<X.n_rows; ++row) { u32 index = 0; T min_val = std::abs(X.at(row,index)); for(u32 col=1; col<X.n_cols; ++col) { const T tmp_val = std::abs(X.at(row,col)); if(tmp_val < min_val) { min_val = tmp_val; index = col; } } out[row] = X.at(row,index); } } }