[Numpy-discussion] how to round to int (I mean 5.2 to 5 not 5.0)
Alan G Isaac
aisaac@american....
Tue Mar 6 23:02:59 CST 2007
On Tue, 6 Mar 2007, Sebastian Haase apparently wrote:
> why does
> numpy.round(a)
> return a float ?
Because it works with a copy of a.
>>> help(N.round)
Help on function round_ in module numpy.core.fromnumeric:
round_(a, decimals=0, out=None)
Returns reference to result. Copies a and rounds to 'decimals' places.
Keyword arguments:
decimals -- number of decimal places to round to (default 0).
out -- existing array to use for output (default copy of a).
Returns:
Reference to out, where None specifies a copy of the original array a.
>>> a = N.random.random((10,))*100
>>> a
array([ 45.01971148, 8.32961759, 39.75272544, 79.76986159,
23.66331127, 24.25584246, 38.17354106, 16.57977389,
50.63676986, 83.15113716])
>>> b = N.empty((10,),dtype='int')
>>> N.round(a,out=b)
array([45, 8, 40, 80, 24, 24, 38, 17, 51, 83])
>>> b
array([45, 8, 40, 80, 24, 24, 38, 17, 51, 83])
Cheers,
Alan Isaac
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