On Thu, Mar 13, 2008 at 05:44:54PM -0400, Alan G Isaac wrote:
> Looks like I misunderstood your question:
> you want an **array** of strings?
> In principle you should be able to use ``fromiter``,
> I believe, but it does not work. BUG? (Crasher.)
>
> >>> import numpy as N
> >>> x = [1,2,3]
> >>> fmt="%03d"
> >>> N.fromiter([xi for xi in x],dtype='S')
> Python crashes.
It crashes indeed. The problem seems to be with dtype, the element size is
taken to be
elsize = dtype->elsize
which is 0 when called with dtype='S'!
Afterwards, in the line:
if (elcount <= (intp)((~(size_t)0) / elsize))
a 'Floating point exception' is generated.
Two questions:
1. why is is it a _floating point_ exception? The variables in question are
ints,
and the relevant line in disassembly looks like:
0xb7b7a413 <PyArray_FromIter+451>: divl 0xffffffd8(%ebp)
The string 'Floating point exception' comes from libc, I think, but it is
imprecise.
A simple program:
int main(void){ return 3/0; };
gives the same message.
2. what does dtype with dtype.elsize==0 mean? Should it be allowed at all?
If it is sometimes valid, then PyArray_FromIter should be fixed.
Cheers,
Zbyszek
_______________________________________________
Numpy-discussion mailing list
Numpy-discussion@scipy.org
http://projects.scipy.org/mailman/listinfo/numpy-discussion
