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1 """
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2 .. deprecated:: 1.20
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3
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4 *This module is deprecated. Instead of importing functions from*
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5 ``numpy.dual``, *the functions should be imported directly from NumPy
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6 or SciPy*.
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7
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8 Aliases for functions which may be accelerated by SciPy.
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9
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10 SciPy_ can be built to use accelerated or otherwise improved libraries
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11 for FFTs, linear algebra, and special functions. This module allows
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12 developers to transparently support these accelerated functions when
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13 SciPy is available but still support users who have only installed
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14 NumPy.
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15
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16 .. _SciPy : https://www.scipy.org
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17
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18 """
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19 import warnings
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20
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21
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22 warnings.warn('The module numpy.dual is deprecated. Instead of using dual, '
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23 'use the functions directly from numpy or scipy.',
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24 category=DeprecationWarning,
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25 stacklevel=2)
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26
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27 # This module should be used for functions both in numpy and scipy if
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28 # you want to use the numpy version if available but the scipy version
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29 # otherwise.
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30 # Usage --- from numpy.dual import fft, inv
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31
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32 __all__ = ['fft', 'ifft', 'fftn', 'ifftn', 'fft2', 'ifft2',
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33 'norm', 'inv', 'svd', 'solve', 'det', 'eig', 'eigvals',
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34 'eigh', 'eigvalsh', 'lstsq', 'pinv', 'cholesky', 'i0']
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35
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36 import numpy.linalg as linpkg
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37 import numpy.fft as fftpkg
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38 from numpy.lib import i0
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39 import sys
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40
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41
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42 fft = fftpkg.fft
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43 ifft = fftpkg.ifft
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44 fftn = fftpkg.fftn
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45 ifftn = fftpkg.ifftn
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46 fft2 = fftpkg.fft2
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47 ifft2 = fftpkg.ifft2
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48
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49 norm = linpkg.norm
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50 inv = linpkg.inv
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51 svd = linpkg.svd
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52 solve = linpkg.solve
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53 det = linpkg.det
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54 eig = linpkg.eig
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55 eigvals = linpkg.eigvals
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56 eigh = linpkg.eigh
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57 eigvalsh = linpkg.eigvalsh
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58 lstsq = linpkg.lstsq
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59 pinv = linpkg.pinv
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60 cholesky = linpkg.cholesky
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61
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62 _restore_dict = {}
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63
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64 def register_func(name, func):
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65 if name not in __all__:
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66 raise ValueError("{} not a dual function.".format(name))
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67 f = sys._getframe(0).f_globals
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68 _restore_dict[name] = f[name]
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69 f[name] = func
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70
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71 def restore_func(name):
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72 if name not in __all__:
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73 raise ValueError("{} not a dual function.".format(name))
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74 try:
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75 val = _restore_dict[name]
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76 except KeyError:
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77 return
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78 else:
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79 sys._getframe(0).f_globals[name] = val
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80
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81 def restore_all():
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82 for name in _restore_dict.keys():
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83 restore_func(name)
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