I have some ancient code (5 years old) and how I used to access real_fft() method was this:
from FFT import *
real_fft(data, fft_length)
I guess the FFT module came with NumPy. Now, years later I installed the NumPy 1.6.1 with
pip install numpy
And all I see in the docs http://www.scipy.org/Numpy_Functions_by_Category , are these functions:
fft()
fftfreq()
fftshift()
ifft()
It is strange, because in this numpy docs, real_fft() is there:
http://numpy.sourceforge.net/numdoc/HTML/numdoc.htm#pgfId-304711
It looks like NumPy underwent some reorganisation in recent years.
http://www.scipy.org/Numpy_Example_List_With_Doc#fft
FFT is now numpy.fft, and real_fft() seems to be renamed into rfft()
>>> from numpy import *
>>>
>>> signal = array([-2., 8., -6., 4., 1., 0., 3., 5.])
>
>>> from numpy.fft import *
>>>
>>>
>>> f = fft(signal)
>>>
>>>
>>> print f
[ 13.00000000 +0.j 3.36396103 +4.05025253j 2.00000000 +1.j
-9.36396103-13.94974747j -21.00000000 +0.j -9.36396103+13.94974747j
2.00000000 -1.j 3.36396103 -4.05025253j]
>>>
>>>
>>>
>>>
>>> f = rfft(signal)
>>>
>>> print f
[ 13.00000000 +0.j 3.36396103 +4.05025253j 2.00000000 +1.j
-9.36396103-13.94974747j -21.00000000 +0.j ]
>>>
>>>
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