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author | Nao Pross <np@0hm.ch> | 2024-02-12 14:52:43 +0100 |
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committer | Nao Pross <np@0hm.ch> | 2024-02-12 14:52:43 +0100 |
commit | eda5bc26f44ee9a6f83dcf8c91f17296d7fc509d (patch) | |
tree | bc2efa38ff4e350f9a111ac87065cd7ae9a911c7 /src/armadillo/include/armadillo_bits/fn_fft2.hpp | |
download | fsisotool-eda5bc26f44ee9a6f83dcf8c91f17296d7fc509d.tar.gz fsisotool-eda5bc26f44ee9a6f83dcf8c91f17296d7fc509d.zip |
Move into version control
Diffstat (limited to 'src/armadillo/include/armadillo_bits/fn_fft2.hpp')
-rw-r--r-- | src/armadillo/include/armadillo_bits/fn_fft2.hpp | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/src/armadillo/include/armadillo_bits/fn_fft2.hpp b/src/armadillo/include/armadillo_bits/fn_fft2.hpp new file mode 100644 index 0000000..51ea0da --- /dev/null +++ b/src/armadillo/include/armadillo_bits/fn_fft2.hpp @@ -0,0 +1,136 @@ +// 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 fn_fft2 +//! @{ + + + +// 2D FFT & 2D IFFT + + + +template<typename T1> +arma_warn_unused +inline +typename +enable_if2 + < + is_arma_type<T1>::value, + Mat< std::complex<typename T1::pod_type> > + >::result +fft2(const T1& A) + { + arma_extra_debug_sigprint(); + + // not exactly efficient, but "better-than-nothing" implementation + + typedef typename T1::pod_type T; + + Mat< std::complex<T> > B = fft(A); + + // for square matrices, strans() will work out that an inplace transpose can be done, + // hence we can potentially avoid creating a temporary matrix + + B = strans(B); + + return strans( fft(B) ); + } + + + +template<typename T1> +arma_warn_unused +inline +typename +enable_if2 + < + is_arma_type<T1>::value, + Mat< std::complex<typename T1::pod_type> > + >::result +fft2(const T1& A, const uword n_rows, const uword n_cols) + { + arma_extra_debug_sigprint(); + + typedef typename T1::elem_type eT; + + const quasi_unwrap<T1> tmp(A); + const Mat<eT>& B = tmp.M; + + const bool do_resize = (B.n_rows != n_rows) || (B.n_cols != n_cols); + + return (do_resize) ? fft2(resize(B,n_rows,n_cols)) : fft2(B); + } + + + +template<typename T1> +arma_warn_unused +inline +typename +enable_if2 + < + (is_arma_type<T1>::value && (is_cx_float<typename T1::elem_type>::yes || is_cx_double<typename T1::elem_type>::yes)), + Mat< std::complex<typename T1::pod_type> > + >::result +ifft2(const T1& A) + { + arma_extra_debug_sigprint(); + + // not exactly efficient, but "better-than-nothing" implementation + + typedef typename T1::pod_type T; + + Mat< std::complex<T> > B = ifft(A); + + // for square matrices, strans() will work out that an inplace transpose can be done, + // hence we can potentially avoid creating a temporary matrix + + B = strans(B); + + return strans( ifft(B) ); + } + + + +template<typename T1> +arma_warn_unused +inline +typename +enable_if2 + < + (is_arma_type<T1>::value && (is_cx_float<typename T1::elem_type>::yes || is_cx_double<typename T1::elem_type>::yes)), + Mat< std::complex<typename T1::pod_type> > + >::result +ifft2(const T1& A, const uword n_rows, const uword n_cols) + { + arma_extra_debug_sigprint(); + + typedef typename T1::elem_type eT; + + const quasi_unwrap<T1> tmp(A); + const Mat<eT>& B = tmp.M; + + const bool do_resize = (B.n_rows != n_rows) || (B.n_cols != n_cols); + + return (do_resize) ? ifft2(resize(B,n_rows,n_cols)) : ifft2(B); + } + + + +//! @} |