Kaushik Ghose <Kaushik_Ghose@...2126...> writes:

In [2]: pylab.arange(0.5,1.0,.1)

Out[2]: array([ 0.5, 0.6, 0.7, 0.8, 0.9]) <---- OKIn [3]: pylab.arange(0.5,1.1,.1)

Out[3]: array([ 0.5, 0.6, 0.7, 0.8, 0.9, 1. , 1.1]) <----- Not OK

The "bug" is really in numpy, which is where pylab imports arange from,

but even then it's not exactly a bug but a feature of floating-point

numerics (.1 is not exactly representable in binary floating-point, so

the equality comparison done by arange doesn't make much sense). Use

linspace if you know how many values you want:

In [4]: linspace(0.5,1.0,num=5,endpoint=False)

Out[4]: array([ 0.5, 0.6, 0.7, 0.8, 0.9])

In [5]: linspace(0.5,1.1,num=6,endpoint=False)

Out[5]: array([ 0.5, 0.6, 0.7, 0.8, 0.9, 1. ])

## ···

--

Jouni K. Sepp�nen

http://www.iki.fi/jks