Hi!
I try to solve loglik with sympy. Here an example:
from sympy import *
sigma2 = symbols('sigma2', real=True, positive=True)
alpha, beta =symbols('alpha beta', real=True)
k, n = symbols('k n', integer=True)
Xk = Indexed('X', k)
Yk = Indexed('Y', k)
loglik = -1/2 * log(2*pi*sigma2) - 1/(2*sigma2) * Sum( (Yk - alpha -
beta*Xk)**2, (k,1,n))
ldbeta = diff(loglik, beta)
Now I try to
>>>betahat = loglik.diff(beta).solve(beta)
Traceback (most recent call last):
File "<pyshell#114>", line 1, in <module>
loglik.diff(beta).solve(beta)
AttributeError: 'Mul' object has no attribute 'solve'
but don't work. Ideas?
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