[Numpy-discussion] printing structured arrays

Skipper Seabold jsseabold@gmail....
Mon Mar 8 13:04:56 CST 2010


On Mon, Mar 8, 2010 at 2:01 PM,  <josef.pktd@gmail.com> wrote:
> On Mon, Mar 8, 2010 at 1:55 PM, Tim Michelsen
> <timmichelsen@gmx-topmail.de> wrote:
>> Hello,
>> I am also looking into the convertsion from strcutured arrays to ndarray.
>>
>>> I've just started playing with numpy and have noticed that when printing
>>> a structured array that the output is not nicely formatted. Is there a
>>> way to make the formatting look the same as it does for an unstructured
>>> array?
>>
>>> Output is:
>>> ### ndarray
>>> [[ 1.   2. ]
>>>  [ 3.   4.1]]
>>> ### structured array
>>> [(1.0, 2.0) (3.0, 4.0999999999999996)]
>> How could we make this structured array look like the above shown
>> ndarray with shape (2, 2)?
>
> .view(float) should do it, to created a ndarray view of the structured
> array data
>

Plus a reshape.  I usually know how many columns I have, so I put in
axis 1 and leave axis 0 as -1.

In [21]: a.view(float).reshape(-1,2)
Out[21]:
array([[ 1. ,  2. ],
       [ 3. ,  4.1]])


Skipper


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