# Copyright (C) 2012 Josh Willis
#
# This program is free software; you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation; either version 3 of the License, or (at your
# option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
# Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
# =============================================================================
#
# Preamble
#
# =============================================================================
#
"""
This module provides the numpy backend of the fast Fourier transform
for the PyCBC package.
"""
import numpy.fft
[docs]def fft(invec,outvec,prec,itype,otype):
if invec.ptr == outvec.ptr:
raise NotImplementedError("numpy backend of pycbc.fft does not support in-place transforms")
if itype == 'complex' and otype == 'complex':
outvec.data = numpy.asarray(numpy.fft.fft(invec.data),dtype=outvec.dtype)
elif itype == 'real' and otype == 'complex':
outvec.data = numpy.asarray(numpy.fft.rfft(invec.data),dtype=outvec.dtype)
[docs]def ifft(invec,outvec,prec,itype,otype):
if invec.ptr == outvec.ptr:
raise NotImplementedError("numpy backend of pycbc.fft does not support in-place transforms")
if itype == 'complex' and otype == 'complex':
outvec.data = numpy.asarray(numpy.fft.ifft(invec.data),dtype=outvec.dtype)
outvec *= len(outvec)
elif itype == 'complex' and otype == 'real':
outvec.data = numpy.asarray(numpy.fft.irfft(invec.data,len(outvec)),
dtype=outvec.dtype)
outvec *= len(outvec)