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Diffstat (limited to 'src/armadillo/include/armadillo_bits/glue_hist_meat.hpp')
| -rw-r--r-- | src/armadillo/include/armadillo_bits/glue_hist_meat.hpp | 253 |
1 files changed, 253 insertions, 0 deletions
diff --git a/src/armadillo/include/armadillo_bits/glue_hist_meat.hpp b/src/armadillo/include/armadillo_bits/glue_hist_meat.hpp new file mode 100644 index 0000000..ec5b4a3 --- /dev/null +++ b/src/armadillo/include/armadillo_bits/glue_hist_meat.hpp @@ -0,0 +1,253 @@ +// 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_hist +//! @{ + + +template<typename eT> +inline +void +glue_hist::apply_noalias(Mat<uword>& out, const Mat<eT>& X, const Mat<eT>& C, const uword dim) + { + arma_extra_debug_sigprint(); + + arma_debug_check( ((C.is_vec() == false) && (C.is_empty() == false)), "hist(): parameter 'centers' must be a vector" ); + + const uword X_n_rows = X.n_rows; + const uword X_n_cols = X.n_cols; + + const uword C_n_elem = C.n_elem; + + if( C_n_elem == 0 ) { out.reset(); return; } + + arma_debug_check + ( + ((Col<eT>(const_cast<eT*>(C.memptr()), C_n_elem, false, false)).is_sorted("strictascend") == false), + "hist(): given 'centers' vector does not contain monotonically increasing values" + ); + + const eT* C_mem = C.memptr(); + const eT center_0 = C_mem[0]; + + if(dim == 0) + { + out.zeros(C_n_elem, X_n_cols); + + for(uword col=0; col < X_n_cols; ++col) + { + const eT* X_coldata = X.colptr(col); + uword* out_coldata = out.colptr(col); + + for(uword row=0; row < X_n_rows; ++row) + { + const eT val = X_coldata[row]; + + if(arma_isfinite(val)) + { + eT opt_dist = (center_0 >= val) ? (center_0 - val) : (val - center_0); + uword opt_index = 0; + + for(uword j=1; j < C_n_elem; ++j) + { + const eT center = C_mem[j]; + const eT dist = (center >= val) ? (center - val) : (val - center); + + if(dist < opt_dist) + { + opt_dist = dist; + opt_index = j; + } + else + { + break; + } + } + + out_coldata[opt_index]++; + } + else + { + // -inf + if(val < eT(0)) { out_coldata[0]++; } + + // +inf + if(val > eT(0)) { out_coldata[C_n_elem-1]++; } + + // ignore NaN + } + } + } + } + else + if(dim == 1) + { + out.zeros(X_n_rows, C_n_elem); + + if(X_n_rows == 1) + { + const uword X_n_elem = X.n_elem; + const eT* X_mem = X.memptr(); + uword* out_mem = out.memptr(); + + for(uword i=0; i < X_n_elem; ++i) + { + const eT val = X_mem[i]; + + if(is_finite(val)) + { + eT opt_dist = (val >= center_0) ? (val - center_0) : (center_0 - val); + uword opt_index = 0; + + for(uword j=1; j < C_n_elem; ++j) + { + const eT center = C_mem[j]; + const eT dist = (val >= center) ? (val - center) : (center - val); + + if(dist < opt_dist) + { + opt_dist = dist; + opt_index = j; + } + else + { + break; + } + } + + out_mem[opt_index]++; + } + else + { + // -inf + if(val < eT(0)) { out_mem[0]++; } + + // +inf + if(val > eT(0)) { out_mem[C_n_elem-1]++; } + + // ignore NaN + } + } + } + else + { + for(uword row=0; row < X_n_rows; ++row) + { + for(uword col=0; col < X_n_cols; ++col) + { + const eT val = X.at(row,col); + + if(arma_isfinite(val)) + { + eT opt_dist = (center_0 >= val) ? (center_0 - val) : (val - center_0); + uword opt_index = 0; + + for(uword j=1; j < C_n_elem; ++j) + { + const eT center = C_mem[j]; + const eT dist = (center >= val) ? (center - val) : (val - center); + + if(dist < opt_dist) + { + opt_dist = dist; + opt_index = j; + } + else + { + break; + } + } + + out.at(row,opt_index)++; + } + else + { + // -inf + if(val < eT(0)) { out.at(row,0)++; } + + // +inf + if(val > eT(0)) { out.at(row,C_n_elem-1)++; } + + // ignore NaN + } + } + } + } + } + } + + + +template<typename T1, typename T2> +inline +void +glue_hist::apply(Mat<uword>& out, const mtGlue<uword,T1,T2,glue_hist>& expr) + { + arma_extra_debug_sigprint(); + + const uword dim = expr.aux_uword; + + arma_debug_check( (dim > 1), "hist(): 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(out) || UB.is_alias(out)) + { + Mat<uword> tmp; + + glue_hist::apply_noalias(tmp, UA.M, UB.M, dim); + + out.steal_mem(tmp); + } + else + { + glue_hist::apply_noalias(out, UA.M, UB.M, dim); + } + } + + + +template<typename T1, typename T2> +inline +void +glue_hist_default::apply(Mat<uword>& out, const mtGlue<uword,T1,T2,glue_hist_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(out) || UB.is_alias(out)) + { + Mat<uword> tmp; + + glue_hist::apply_noalias(tmp, UA.M, UB.M, dim); + + out.steal_mem(tmp); + } + else + { + glue_hist::apply_noalias(out, UA.M, UB.M, dim); + } + } + + +//! @} |