[Numpy-discussion] RuntimeWarning: Item size computed from the PEP 3118
Wed Nov 17 04:07:20 CST 2010
Wed, 17 Nov 2010 08:40:50 +0100, Laurent Gautier wrote:
> __main__:1: RuntimeWarning: Item size computed from the PEP 3118 buffer
> format string does not match the actual item size.
> I tried tracing a bit further but I am a little confused by what is the
> intent (a lot of nested calls).
Numpy is warning you that the view that you passed to it is inconsistent,
and it indicates that it refuses to consider it as a PEP 3118 buffer. If
you use it on Python 2.x, it probably falls back to using the legacy
buffer interface which does not care about the format string.
> my buffer format is 'f', and the view has itemsize set as:
> view->itemsize = sizeof(double);
> Any pointer regarding what might be going on ?
The format 'f' means 32-bit float, so the view itemsize should be
sizeof(float) and not sizeof(double). If your view really contains floats
in sizeof(double) bytes, the buffer format string probably should
indicate the padding.
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