On Feb 15, 2008 1:35 PM, wdbragg <[EMAIL PROTECTED]> wrote:
>
> import pylab as p
> x = p.arange(-100, 300, 10)
> y = abs(x)
> p.plot(x, y, 'go')
> p.savefig('plot.png')
>
> This works as expected. However, if I change the function from abs to
> cos...
>
> import pylab as p
> x = p.arange(-100, 300, 10)
> y = cos(x)
> p.plot(x, y, 'go')
> p.savefig('plot.png')
>
> This fails ... seems like a coercion problem. Can anyone tell me what
> is wrong in the second case. I need to figure this one out.
Instead of writing
y = cos(x)
use
y = p.cos(x)
This will use the vectorized version of cos that is defined in pylab
instead of the
symbolic sage version of cos.
(That said, I think it would be reasonable for us to change the Sage
cos, etc., to
call the vectorized versions included in numpy whenever a numpy array is given
as input.)
William
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