Computing FFT with Python NumPy 1.0

[mcdurr@gmail.com]

I recently installed Python 2.5 on Windows and also installed numpy
1.0. I'd like to compute an FFT on an array of numbers but I can't
seem to access the FFT function. I'm fairly new to Python (obviously)
and I can't seem to find documentation to match my distribution of
numpy and I can't figure out how to access the FFT function.

Python 2.5 (r25:51908, Sep 19 2006, 09:52:17) [MSC v.1310 32 bit
(Intel)] on win32
Type "copyright" , "credits" or "license()" for more information.

IDLE 1.2

>>from numpy import *
>>a=array((1,2, 3,2,1,2,3,2,1))
>>fft(a)

Traceback (most recent call last):
File "<pyshell#2 >", line 1, in <module>
fft(a)
TypeError: 'module' object is not callable

>>>

Help appreciated thanks.

[Tim Leslie]

Re: Computing FFT with Python NumPy 1.0

On 1 Nov 2006 16:04:59 -0800, mcdurr@gmail.co m <mcdurr@gmail.c omwrote:

I recently installed Python 2.5 on Windows and also installed numpy
1.0. I'd like to compute an FFT on an array of numbers but I can't
seem to access the FFT function. I'm fairly new to Python (obviously)
and I can't seem to find documentation to match my distribution of
numpy and I can't figure out how to access the FFT function.
>
Python 2.5 (r25:51908, Sep 19 2006, 09:52:17) [MSC v.1310 32 bit
(Intel)] on win32
Type "copyright" , "credits" or "license()" for more information.
>
IDLE 1.2

>from numpy import *
>a=array((1,2,3 ,2,1,2,3,2,1))
>fft(a)

>
Traceback (most recent call last):
File "<pyshell#2 >", line 1, in <module>
fft(a)
TypeError: 'module' object is not callable

>>

>
Help appreciated thanks.

The fft routines now live in numpy.fft.

>>from numpy.fft import fft
>>from numpy import array
>>a=array((1,2, 3,2,1,2,3,2,1))
>>fft(a)

array([ 17. +0.j , -1.15270364-0.41954982j,
-3.37938524-2.83564091j, 0.5 +0.8660254j ,
0.03208889+0.18 198512j, 0.03208889-0.18198512j,
0.5 -0.8660254j , -3.37938524+2.83 564091j,
-1.15270364+0.41 954982j])

>
--

http://mail.python.org/mailman/listinfo/python-list

>

[Robert Kern]

Re: Computing FFT with Python NumPy 1.0

mcdurr@gmail.co m wrote:

I recently installed Python 2.5 on Windows and also installed numpy
1.0.

You will want to ask numpy questions on the numpy mailing list.

http://www.scipy.org/Mailing_Lists

I'd like to compute an FFT on an array of numbers but I can't
seem to access the FFT function. I'm fairly new to Python (obviously)
and I can't seem to find documentation to match my distribution of
numpy and I can't figure out how to access the FFT function.
>
Python 2.5 (r25:51908, Sep 19 2006, 09:52:17) [MSC v.1310 32 bit
(Intel)] on win32
Type "copyright" , "credits" or "license()" for more information.
>
IDLE 1.2

>>>from numpy import *
>>>a=array((1,2 ,3,2,1,2,3,2,1) )
>>>fft(a)

>
Traceback (most recent call last):
File "<pyshell#2 >", line 1, in <module>
fft(a)
TypeError: 'module' object is not callable

All of the fft functions are in the numpy.fft module.

>>from numpy import *
>>a=array((1,2, 3,2,1,2,3,2,1))
>>fft.fft(a)

array([ 1.70000000e+01+ 0.j , -1.15270364e+00-0.41954982j,
-3.37938524e+00-2.83564091j, 5.00000000e-01+0.8660254j ,
3.20888862e-02+0.18198512j, 3.20888862e-02-0.18198512j,
5.00000000e-01-0.8660254j , -3.37938524e+00+ 2.83564091j,
-1.15270364e+00+ 0.41954982j])

--
Robert Kern

"I have come to believe that the whole world is an enigma, a harmless enigma
that is made terrible by our own mad attempt to interpret it as though it had
an underlying truth."
-- Umberto Eco