[Numpy-discussion] Quite curious behaviour in Numeric
SIMOND Gilles
Gilles.Simond at obs.unige.ch
Thu Apr 7 07:55:08 EDT 2005
2.6.8-1-686-smp (dilinger at toaster.hq.voxel.net)
(gcc version 3.3.4 (Debian 1:3.3.4-9))
#1 SMP Sat Aug 28 12:51:43 EDT 2004:
and python2.3
>>> a=Numeric.ones((2,3),'i')
>>> b=Numeric.sum(a)+1
>>> a[1]=b+1
Traceback (most recent call last):
File "<stdin>", line 1, in ?
TypeError: Array can not be safely cast to required type
>>> a.itemsize()
4
>>> b.itemsize()
4
>>> a.typecode()
'i'
and e following works
>>> a=Numeric.ones((2,3))
>>> b=Numeric.sum(a)+1
>>> a[1]=b+1
>>> a.itemsize()
4
>>> b.itemsize()
4
>>> a.typecode()
'l'
>>> type(1)
<type 'int'>
>>> Numeric.__version__
'23.6'
It seems that itemsize() does not return the correct value which
should be 8 for 'l' type array. This is quite annoying since this
function is the only way to know actual format of the array.
Gilles Simond
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