Re: [Matplotlib-users] autocorrelation question

Hi bala,
what is the input? How did you calculate it?

Francesco

2012/6/19 Bala subramanian <bal...@gm...>

> Friends,
> I want to plot the autocorrelation of my data as a function of time as
> given in the following link, with autocorrelation coef in Y axis and Time
> in x-axis.
>
> http://www.itl.nist.gov/div898/handbook/eda/section3/autocopl.htm
>
> I used the following code to achieve the same using the acorr function.
> But the acorr function doesnt seem to plot the autocorrelation coef. as a
> function of time. Why is it so ?. The output figure is attached. I want to
> plot the time dependent decay of my values.
>
>
> import matplotlib.pyplot as plt
> import numpy as np
>
> data1=np.loadtxt('oe_short.dat',usecols=(5,))
> data2=np.loadtxt('7o_short.dat',usecols=(5,))
>
> #Assignments
> FIG=plt.figure(figsize=(4.0,2.5),dpi=50)
> FIG.subplots_adjust(hspace=0.15)
> NR=1;NC=1
> cols=['black','red']
> ax1=FIG.add_subplot(NR,NC,1)
> ax1.xcorr(data1,data1,color=cols[0],usevlines=False)
> ax1.acorr(data2,color=cols[1],usevlines=False)
> plt.savefig('auto.png',dpi=50)
> plt.show()
>
>
> --
> C. Balasubramanian
>
>
>
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-- 
Cordiali saluti, Dr.Oteri Francesco