[SciPy-user] Scipy optimize fmin_l_bfgs_b gives me an obscure error
Nils Wagner
nwagner at iam.uni-stuttgart.de
Thu Jul 10 02:06:43 EDT 2008
On Wed, 9 Jul 2008 19:17:58 -0400
"Isaul Vargas" <isaulv at gmail.com> wrote:
> Here is how my function looks like:
>
> xt = scipy.optimize.fmin_l_bfgs_b(obj_grad_func, xcur,
>args =
> (b,h,Beta,R,wR,wh,muh, alpha_b, beta_b, BN, sp), maxfun
>= 1000)
>
>
> the args are mostly arrays except for BN and SP which
>are dicts that contain
> various flags.
>
> In the debugger, I tried the following:
> xcur is a 1,3 array with the values 1,1,0.
> I check the flags of xcur and I see it is not fortran
>contiguous.
> I do a copy: xcur2 = xcur.copy('f')
> and now I get this error message:
> *** error: failed in converting 10th argument `wa' of
>_lbfgsb.setulb to
> C/Fortra
> n array
>
> There is no variable 'wa' in any of my functions, so I
>am not sure why this
> failing.
>
> Also, how do I setup the bounds, I am not clear on how
>to set it. I have a
> list of upper bounds (an array of 3 values) and a list
>of lower bounds Not
> sure how to set them.
For lower and upper bounda:
bounds = [(2000.,2100.),(1800.,1850.),(1600.,1630.)]
x_lbl,f,d = optimize.fmin_l_bfgs_b(func1, x0, fprime=None,
args=(), approx_grad=1, bounds=bounds)
Nils
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