[Numpy-discussion] strange conversion integer to float

[Matthieu Brucher]

Hi,

If I remember correctly, float is a double (precision float). The precision
is more important in doubles (float64) than in usual floats (float32). And
20091231 can not be reprensented in 32bits floats.

Matthieu

2011/12/17 Alex van Houten <sparrow2867 at yahoo.com>

> Try this:
> $ python
> Python 2.7.1 (r271:86832, Apr 12 2011, 16:15:16)
> [GCC 4.6.0 20110331 (Red Hat 4.6.0-2)] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
> >>> import numpy as np
> >>> np.__version__
> '1.5.1'
> >>> time=[]
> >>> time.append(20091231)
> >>> time_array=np.array(time,'f')
> >>> time_array
> array([ 20091232.], dtype=float32)
> 20091231--->20091232 Why?
> Note:
> >>> float(20091231)
> 20091231.0
> Thanks,
> Alex.
>
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