[Numpy-discussion] *= operator not intuitive
Dag Sverre Seljebotn
d.s.seljebotn@astro.uio...
Wed Mar 16 08:30:58 CDT 2011
On 03/16/2011 02:24 PM, Paul Anton Letnes wrote:
> Hi!
>
> This little snippet of code tricked me (in a more convoluted form). The *= operator does not change the datatype of the left hand side array. Is this intentional? It did fool me and throw my results quite a bit off. I always assumed that 'a *= b' means exactly the same as 'a = a * b' but this is clearly not the case!
In [1]: a = np.ones(5)
In [2]: b = a
In [3]: c = a * 2
In [4]: b
Out[4]: array([ 1., 1., 1., 1., 1.])
In [5]: a *= 2
In [6]: b
Out[6]: array([ 2., 2., 2., 2., 2.])
-- Dag
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