Re: [Matplotlib-users] dates fail after upgrade

[PGM <pgm...@gm...>]

On Friday 28 July 2006 17:19, Richard Ruth wrote:
> I upgraded to matplotlib-0.87.4  Now I receive an error like the following
> every time I try to use matplotlib.dates.  The following error messages
> were generated when I tried to run matplotlib-0.87.4/examples/date_demo1.py
>
> Any Idea on how I can get dates working again?
> (I am running the 2.6.17.6 kernel on a 64-bit linux system)

Richard,
in matplotlib/dates.py, change line 155 from
remainder = x - ix
to
remainder = float(x) - ix

The problem is that matplotlib uses numpy arrays for the xaxis. As you have a 
64b system, the arrays are in float64scalars, that divmod doesn't know how to 
process (unless you have a very recent of numpy). The trick above forces a 
downcasting of float64scalar to float32scalar, divmod can now work.