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// SPDX-License-Identifier: Apache-2.0
//
// Copyright 2008-2016 Conrad Sanderson (http://conradsanderson.id.au)
// Copyright 2008-2016 National ICT Australia (NICTA)
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// ------------------------------------------------------------------------
//! \addtogroup glue_histc
//! @{
template<typename eT>
inline
void
glue_histc::apply_noalias(Mat<uword>& C, const Mat<eT>& A, const Mat<eT>& B, const uword dim)
{
arma_extra_debug_sigprint();
arma_debug_check( ((B.is_vec() == false) && (B.is_empty() == false)), "histc(): parameter 'edges' must be a vector" );
const uword A_n_rows = A.n_rows;
const uword A_n_cols = A.n_cols;
const uword B_n_elem = B.n_elem;
if( B_n_elem == uword(0) ) { C.reset(); return; }
arma_debug_check
(
((Col<eT>(const_cast<eT*>(B.memptr()), B_n_elem, false, false)).is_sorted("strictascend") == false),
"hist(): given 'edges' vector does not contain monotonically increasing values"
);
const eT* B_mem = B.memptr();
const uword B_n_elem_m1 = B_n_elem - 1;
if(dim == uword(0))
{
C.zeros(B_n_elem, A_n_cols);
for(uword col=0; col < A_n_cols; ++col)
{
const eT* A_coldata = A.colptr(col);
uword* C_coldata = C.colptr(col);
for(uword row=0; row < A_n_rows; ++row)
{
const eT x = A_coldata[row];
for(uword i=0; i < B_n_elem_m1; ++i)
{
if( (B_mem[i] <= x) && (x < B_mem[i+1]) ) { C_coldata[i]++; break; }
else if( B_mem[B_n_elem_m1] == x ) { C_coldata[B_n_elem_m1]++; break; } // for compatibility with Matlab
}
}
}
}
else
if(dim == uword(1))
{
C.zeros(A_n_rows, B_n_elem);
if(A.n_rows == 1)
{
const uword A_n_elem = A.n_elem;
const eT* A_mem = A.memptr();
uword* C_mem = C.memptr();
for(uword j=0; j < A_n_elem; ++j)
{
const eT x = A_mem[j];
for(uword i=0; i < B_n_elem_m1; ++i)
{
if( (B_mem[i] <= x) && (x < B_mem[i+1]) ) { C_mem[i]++; break; }
else if( B_mem[B_n_elem_m1] == x ) { C_mem[B_n_elem_m1]++; break; } // for compatibility with Matlab
}
}
}
else
{
for(uword row=0; row < A_n_rows; ++row)
for(uword col=0; col < A_n_cols; ++col)
{
const eT x = A.at(row,col);
for(uword i=0; i < B_n_elem_m1; ++i)
{
if( (B_mem[i] <= x) && (x < B_mem[i+1]) ) { C.at(row,i)++; break; }
else if( B_mem[B_n_elem_m1] == x ) { C.at(row,B_n_elem_m1)++; break; } // for compatibility with Matlab
}
}
}
}
}
template<typename T1, typename T2>
inline
void
glue_histc::apply(Mat<uword>& C, const mtGlue<uword,T1,T2,glue_histc>& expr)
{
arma_extra_debug_sigprint();
const uword dim = expr.aux_uword;
arma_debug_check( (dim > 1), "histc(): parameter 'dim' must be 0 or 1" );
const quasi_unwrap<T1> UA(expr.A);
const quasi_unwrap<T2> UB(expr.B);
if(UA.is_alias(C) || UB.is_alias(C))
{
Mat<uword> tmp;
glue_histc::apply_noalias(tmp, UA.M, UB.M, dim);
C.steal_mem(tmp);
}
else
{
glue_histc::apply_noalias(C, UA.M, UB.M, dim);
}
}
template<typename T1, typename T2>
inline
void
glue_histc_default::apply(Mat<uword>& C, const mtGlue<uword,T1,T2,glue_histc_default>& expr)
{
arma_extra_debug_sigprint();
const quasi_unwrap<T1> UA(expr.A);
const quasi_unwrap<T2> UB(expr.B);
const uword dim = (T1::is_xvec) ? uword(UA.M.is_rowvec() ? 1 : 0) : uword((T1::is_row) ? 1 : 0);
if(UA.is_alias(C) || UB.is_alias(C))
{
Mat<uword> tmp;
glue_histc::apply_noalias(tmp, UA.M, UB.M, dim);
C.steal_mem(tmp);
}
else
{
glue_histc::apply_noalias(C, UA.M, UB.M, dim);
}
}
//! @}
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