[Tutor] floating point range() ?

[Danny Yoo]

On Thu, 17 Jun 2004, Dave S wrote:

> Is there a floating point range() type builtin ?
>
> I need to generate a sequence for a 'for loop' every 0.5
>
> for i in reange(0,1000,5)
>     j=float(i)/10
>     print j
>
> The above works but seems clumbsy.
>
> Is there a better way ?


Hi Dave,


I don't think there is a built-in equivalent for range()  with floats.
However, it isn't too bad to write something ourselves:

###
def frange(start, stop, skip=1.0):
    """A range-like generator that returns numbers in the interval
    [start, stop).
    """
    i = start
    while i < stop:
        yield i
        i += skip
###



Here's an example of how to use frange():

###
>>> for x in frange(0, 10, 0.5):
...     print x
...
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
9.0
9.5
###

Does this seem reasonable?



Hope this helps!