xorbits.numpy.fft.rfft2#
- xorbits.numpy.fft.rfft2(a, s=None, axes=(- 2, - 1), norm=None)[源代码]#
Compute the 2-dimensional FFT of a real array.
- 参数
a (array) – Input array, taken to be real.
s (sequence of ints, optional) – Shape of the FFT.
axes (sequence of ints, optional) – Axes over which to compute the FFT.
norm ({"backward", "ortho", "forward"}, optional) –
1.10.0(numpy.fft) 新版功能.
Normalization mode (see numpy.fft). Default is “backward”. Indicates which direction of the forward/backward pair of transforms is scaled and with what normalization factor.
1.20.0(numpy.fft) 新版功能: The “backward”, “forward” values were added.
- 返回
out – The result of the real 2-D FFT.
- 返回类型
ndarray
参见
rfftn
Compute the N-dimensional discrete Fourier Transform for real input.
提示
This is really just rfftn with different default behavior. For more details see rfftn.
实际案例
>>> a = np.mgrid[:5, :5][0] >>> np.fft.rfft2(a) array([[ 50. +0.j , 0. +0.j , 0. +0.j ], [-12.5+17.20477401j, 0. +0.j , 0. +0.j ], [-12.5 +4.0614962j , 0. +0.j , 0. +0.j ], [-12.5 -4.0614962j , 0. +0.j , 0. +0.j ], [-12.5-17.20477401j, 0. +0.j , 0. +0.j ]])
This docstring was copied from numpy.fft.