[SciPy-dev] logarithmic determinant in an absolute value sense

Nils Wagner nwagner at mecha.uni-stuttgart.de
Mon Mar 20 06:39:46 CST 2006


Hi all,

 
I hope this function will be of interest.
Any comment would be appreciated.

Nils


from scipy import *

n = 200
A_1 = 1.e-2*(rand(n,n)+rand(n,n)*1j)
A_2 = 1.e-3*(rand(n,n)+rand(n,n)*1j)

def logabsdet(A):
    "Return the logarithmic determinant in an absolute value sense"

    p,l,u = linalg.lu(A)
    return sum(log(abs(diag(u))))


res_1 = logabsdet(A_1)
res_2 = logabsdet(A_2)

print res_1, log(abs(linalg.det(A_1)))
print res_2, log(abs(linalg.det(A_2)))




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