[Numpy-discussion] Padding policy in CharArrays
faltet at carabos.com
Mon Jan 3 13:26:27 CST 2005
A Dilluns 03 Gener 2005 17:40, Todd Miller va escriure:
> >>> a=strings.array(None, itemsize = 4, shape=1, kind=strings.RawCharArray)
> >>> a = '0\0\0\0'
> >>> print repr(a >= '0\x00\x00\x00\x01')
> array(, type=Bool)
> You'll note that I "hand padded" the assigned value; because
> RawCharArray is a little used feature, it needs more work. I think
> RawCharArray either makes partial/inconsistent use of NULL padding.
Well, I've already tried that, but what I would like is to have the
possibility to assign values *and* padding with NULL values. However, using
a RawCharArray does not allow this:
>>> a=strings.array(None, itemsize = 4, shape=1, kind=strings.RawCharArray)
>>> a = str(0)
Traceback (most recent call last):
File "<stdin>", line 1, in ?
File "/usr/local/lib/python2.4/site-packages/numarray/strings.py", line 185, in _setitem
where[bo:bo+self._itemsize] = self.pad(value)[0:self._itemsize]
TypeError: right operand length must match slice length
> Give RawCharArray a try; it *is* the basis of CharArray, so it
> basically works but there will likely be a few issues to sort out. My
> guess is that anything that really needs fixing can be added for
Mmm, perhaps having the possibility to select the pad value in CharArray
creation time would be nice.
Francesc Altet >qo< http://www.carabos.com/
Cárabos Coop. V. V V Enjoy Data
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