[SciPy-user] phase wrapping algorithm
Travis Oliphant
oliphant.travis at ieee.org
Tue Oct 10 14:52:49 EDT 2006
Ryan Krauss wrote:
> Thanks Travis.
>
> I looked in scipy.signal and when I didn't see, I just assumed it didn't exist.
>
> I was just starting to make good progess on my FORTRAN version too.....
>
>
The FORTRAN version would be faster and not require memory use. The
NumPy version creates the difference vector, finds discontinuites and
forms a correction vector that is cumsummed and added to the original.
> I may need to revisit this when I need more control over messy
> experimental data. Is there a tricky in-place way to calculate the
>
> difference between a vector and itself shift by 1 or more elements?
>
c[:-1] -= c[1:] # shift-by-one
c[:-2] -= c[2:] # shift-by-two
etc.
This will leave un-changed the last elements of the array.
-Travis
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