[SciPy-User] Discrete integration with delays
Thomas Fitzpatrick
tcf4@njit....
Thu Sep 2 18:02:55 CDT 2010
Can anybody help me with the following equation? It is similar to a correlation,
but I am not sure how this done as scipy's correlation packages are compiled
into a pyd sigtools. I would like to get an array that is the same size as the
input.
Here is the equation I am trying to code:
F(T) = integration[{I(t) + I(t - T)}*E(t)*Econj(t - T)]dt from -inf to +inf
(The code be for a discrete function)
I tried to do it by adapting this autocorrelation function:
N = len(x)
Rxx = np.zeros(N)
for m in range(N):
for n in range(N-m):
Rxx[m] = Rxx[m] + x[n]*x[n+m-1]
Here is my attempt:
f1 = np.zeros(N)
for m in range(N):
for n in range(0, N - m):
f1[m] = f1[m] + .5*(it[n] + it[n + m])*et[n]*et[n + m]
This works pretty well, but it doesn't return an array of the same size as the
input which is an option for the scipy function 'correlate.'
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