scipy tutorial - Baustatik-Info-Server

SciPy Reference Guide, Release 0.8.dev
Examples
loc : array-like, optional
location parameter (default=0)
scale : array-like, optional
scale parameter (default=1)
size : int or tuple of ints, optional
shape of random variates (default computed from input arguments )
moments : string, optional
composed of letters [’mvsk’] specifying which moments to compute where ‘m’
= mean, ‘v’ = variance, ‘s’ = (Fisher’s) skew and ‘k’ = (Fisher’s) kurtosis. (default=’mv’)
>>> import matplotlib.pyplot as plt
>>> numargs = loggamma.numargs
>>> [ ] = [0.9,]*numargs
>>> rv = loggamma()
Display frozen pdf
>>> x = np.linspace(0,np.minimum(rv.dist.b,3))
>>> h=plt.plot(x,rv.pdf(x))
Check accuracy of cdf and ppf
>>> prb = loggamma.cdf(x,)
>>> h=plt.semilogy(np.abs(x-loggamma.ppf(prb,))+1e-20)
Random number generation
>>> R = loggamma.rvs(size=100)
Log gamma distribution
loggamma.pdf(x,c) = exp(c*x-exp(x)) / gamma(c) for all x, c > 0.
548 Chapter 3. Reference