Thanks. Removing the import of pylab and adding your suggested "import
matplotlib.pyplot as plt" worked.
On Sep 14, 2011, at 12:46 PM, Eric Firing wrote:
> On 09/14/2011 09:17 AM, Raymond Hawkins wrote:
>> I'm getting odd behavior when I try to use fmin and pylab in the same
>> program. The issue is illustrated in the code snippet below. As written,
>> fmin won't work: the "print xopt" simply returns the contents of x0 as
>> assigned in the line before fmin. If the "from pylab import *" line is
>> commented out, however, then fmin runs as expected.
>>
>
> This is a good illustration of why "from package_x import *" is so
> strongly discouraged; it is throwing away one of the most important
> features of python--the default separation of packages into their own
> name spaces.
>
> The only exception with respect to pylab is that for quick and dirty
> interactive use, particularly within ipython, it is sometimes worthwhile
> to sacrifice some name space separation for typing speed. But in a
> script that imports from more than one external package, it is best to
> always use explicit imports in some form.
>
> The preferred idiom is to avoid importing pylab at all in scripts;
> instead, do this:
>
> import numpy as np
> import matplotlib.pyplot as plt
>
> Eric
>
>> I'm running python 2.7.2 on a MacBook Pro with a recent install& upgrade of
>> scipy and matplotlib via macports. Any suggestions would be appreciated.
>>
>> -------------------------------------
>>
>> #!/opt/local/bin/python
>>
>> from scipy import *
>> from scipy.optimize import fmin
>> import matplotlib
>> matplotlib.use('MacOSX')
>> from pylab import *
>>
>> def rosen(x): # The Rosenbrock function
>> return sum(100.0*(x[1:]-x[:-1]**2.0)**2.0 + (1-x[:-1])**2.0)
>>
>> x0 = [1.3, 0.7, 0.8, 1.9, 1.2]
>>
>> xopt = fmin(rosen, x0)
>>
>> print xopt
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