[Numpy-discussion] Using normal()
Keith Goodman
kwgoodman at gmail.com
Thu Apr 24 13:58:34 EDT 2008
On Thu, Apr 24, 2008 at 10:51 AM, Rich Shepard <rshepard at appl-ecosys.com> wrote:
> On Thu, 24 Apr 2008, Keith Goodman wrote:
>
> > norm = 1 / (scale * sqrt(2 * pi))
> > y = norm * exp(-power((x - loc), 2) / (2 * scale**2))
>
> Hmm-m-m. I don't understand the source of the error:
>
> y = norm * exp(-pow((x - loc), 2) / (2 * scale**2))
> TypeError: only length-1 arrays can be converted to Python scalars
I don't understand the error (I don't use arrays). Maybe try
evaluating pieces of the formula, like pow(x-loc, 2) etc to see where
the error is.
It works for me:
>> x = arange(0,10)
>> scale=1
>> loc=1
>> norm = 1 / (scale * sqrt(2 * pi))
>> y = norm * exp(-power((x - loc), 2) / (2 * scale**2))
>> y
array([ 1.46762663e-01, 3.98942280e-01, 1.46762663e-01,
5.39909665e-02, 2.68805194e-03, 1.33830226e-04,
9.01740968e-07, 6.07588285e-09, 5.54048800e-12,
5.05227108e-15])
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