[Numpy-discussion] Negative values with unsigned data types problems
Francesc Altet
faltet at carabos.com
Fri Sep 29 07:44:34 EDT 2006
Hi,
I'm writing this here because the numpy Trac seems down:
{{{
Oops...
Trac detected an internal error: The Trac Environment needs to be upgraded.
Run trac-admin /home/scipy/trac/numpy upgrade"
}}}
Well, it seems that there are inconsistencies on creating arrays coming from
negative values using unsigned integers:
In [41]: numpy.asarray([-1], dtype='uint8')
Out[41]: array([255], dtype=uint8)
In [42]: numpy.asarray([-1], dtype='uint16')
Out[42]: array([65535], dtype=uint16)
until here it's fine, but:
In [43]: numpy.asarray([-1], dtype='uint32')
---------------------------------------------------------------------------
<type 'exceptions.TypeError'> Traceback (most recent call last)
/home/faltet/python.nobackup/numpy/<ipython console> in <module>()
/usr/local/lib/python2.5/site-packages/numpy/core/numeric.py in asarray(a,
dtype, order)
129 are converted to base class ndarray.
130 """
--> 131 return array(a, dtype, copy=False, order=order)
132
133 def asanyarray(a, dtype=None, order=None):
<type 'exceptions.TypeError'>: long() argument must be a string or a number,
not 'list'
and the same happens with 'uint64'.
My numpy version is 1.0.dev3216
Regards,
--
>0,0< Francesc Altet http://www.carabos.com/
V V Cárabos Coop. V. Enjoy Data
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