[yt-users] Energy Spectrum

[j s oishi]

Hi Everyone,

I just got the Pyfftw3 wrappers to fftw3 going, and I'll be playing
with some power spectra calculators in yt next week for a project
using both them and the numpy FFT (if the former is not available).
I'll let you know when I get them going, if you're still interested.

j

On Fri, Nov 12, 2010 at 1:47 PM, Matthew Turk <matthewturk at gmail.com> wrote:
> Hi Elizabeth,
>
> As a quick note, if it's a small enough dataset, you can extracted a
> fixed resolution grid of points and use the numpy built-in FFT.
>
> -Matt
>
> On Fri, Nov 12, 2010 at 1:18 PM, Elizabeth Tasker <taskere at mcmaster.ca> wrote:
>> Thank you! I'll give this a go and let you know how I get on.
>>
>> Elizabeth
>>
>> Stephen Skory wrote:
>>>
>>> Elizabeth,
>>>
>>>
>>>>
>>>> There's code to calculate two-point functions (like structure functions
>>>> and two-point correlation functions).  That's almost what you want - you
>>>> could calculate the 2-point correlation function and do a fourier transform
>>>> of it with numpy to get the power spectrum of your desired quantity.  See:
>>>>
>>>> http://yt.enzotools.org/doc/extensions/two_point_functions.html
>>>>
>>>
>>>
>>>
>>> Let me add to Brian's response and say that, even as the author of the
>>> two-point functions framework, I often get confused on how to use it. It's
>>> very flexible and powerful, but not entirely intuitive (which are generally
>>> opposing things). I put two examples at the bottom of that page on how to do
>>> two-point correlations, where the second one is probably closer to what you
>>> want. Let me know if you want help on adapting the example to what you want.
>>>
>>> Good luck!
>>>  Stephen Skory
>>> stephenskory at yahoo.com
>>> http://stephenskory.com/
>>> 510.621.3687 (google voice)
>>>
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>>>
>>
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