[Numpy-discussion] add axis to results of reduction (mean, min, ...)
Robert Kern
robert.kern@gmail....
Thu Aug 6 11:18:59 CDT 2009
On Thu, Aug 6, 2009 at 11:15, Keith Goodman<kwgoodman@gmail.com> wrote:
> thanksOn Thu, Aug 6, 2009 at 9:07 AM, Robert Kern<robert.kern@gmail.com> wrote:
>> On Thu, Aug 6, 2009 at 11:03, Keith Goodman<kwgoodman@gmail.com> wrote:
>>>>> pylab.demean??
>>> Type: function
>>> Base Class: <type 'function'>
>>> String Form: <function demean at 0x3c5c050>
>>> Namespace: Interactive
>>> File: /usr/lib/python2.6/dist-packages/matplotlib/mlab.py
>>> Definition: pylab.demean(x, axis=0)
>>> Source:
>>> def demean(x, axis=0):
>>> "Return x minus its mean along the specified axis"
>>> x = np.asarray(x)
>>> if axis:
>>> ind = [slice(None)] * axis
>>> ind.append(np.newaxis)
>>> return x - x.mean(axis)[ind]
>>> return x - x.mean(axis)
>>
>> Ouch! That doesn't handle axis=-1.
>>
>> if axis != 0:
>> ind = [slice(None)] * x.ndim
>> ind[axis] = np.newaxis
>
> Hey, didn't you warn us about the dangers of "if arr" the other day?
Yes, but actually that wasn't quite the problem. "if axis:" would have
been fine, if a bit obscure, as long as the body was fixed to not
expect axis>0.
--
Robert Kern
"I have come to believe that the whole world is an enigma, a harmless
enigma that is made terrible by our own mad attempt to interpret it as
though it had an underlying truth."
-- Umberto Eco
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