[SciPy-User] possible bug in scipy.optimize.newton_krylov

Matt Chan talcite@gmail....
Wed Aug 29 16:20:04 CDT 2012


Hi,

I'm having trouble setting the tolerance for the inner method of the 
newton-krylov method. Although the documentation says it is possible, 
setting inner_tol returns an error complaining about duplicate arguments. 
http://docs.scipy.org/doc/scipy/reference/generated/scipy.optimize.newton_krylov.html

I've pasted the stack trace below. Is there something I am doing 
incorrectly?

Traceback (most recent call last):
  File "<zip>", line 758, in <module>
    x_star= op.newton_krylov(my_fn, x0, method='lgmres', inner_tol=1e-8)
  File "<string>", line 8, in newton_krylov
  File "/usr/lib64/python2.7/site-packages/scipy/optimize/nonlin.py", line 
294, in nonlin_solve
    dx = -jacobian.solve(Fx, tol=tol)
  File "/usr/lib64/python2.7/site-packages/scipy/optimize/nonlin.py", line 
1394, in solve
    sol, info = self.method(self.op, rhs, tol=tol, **self.method_kw)
TypeError: lgmres() got multiple values for keyword argument 'tol'

Thanks,
Matt
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