Re: [Matplotlib-users] arange

[Robert K. <rob...@gm...>]

Steve Schmerler wrote:
> Hi
> 
> I've a machine where I used Numeric until now. Does the following
> behaviour also occur with numpy?
> 
> 
> In [38]: Numeric.__version__
> Out[38]: '23.8'
> 
> In [39]: a = arange(0, 0.005, 0.00001); len(a)
> Out[39]: 500
> 
> In [40]: a = arange(0, 0.005, 0.000001); len(a)
> Out[40]: 5001
> 
> Shouldn't  len(a)%10 == 0 in these cases?

Yes. Floating point is weird.

http://projects.scipy.org/scipy/numpy/ticket/8

Use numpy.linspace() for reliable results. I think matplotlib exposes
linspace(), too.

-- 
Robert Kern
rob...@gm...

"In the fields of hell where the grass grows high
 Are the graves of dreams allowed to die."
  -- Richard Harter