math module broken?
Roel Schroeven
rschroev_nospam_ml at fastmail.fm
Sat Jul 24 15:35:04 EDT 2004
Peter Otten wrote:
> Roel Schroeven wrote:
>
>
>>When the numbers get larger, floats start losing precision. If you
>>restrict the numbers to the range [0, 360[ before conversion to radians
>>(and hence to degrees), that problem doesn't exist.
>
>
>>>>(360**100 +0.0) % 360
>
> 184.0
>
> Rule of thumb: floats are always inaccurate. % may only help when you are
> dealing with large integers denoting an angle in degrees - an unlikely
> scenario methinks.
Ok, you're right, I only considered the case where the input is
specified in degrees.
Anyway, when dealing with angles it's in most cases very well possible
to keep the values small by doing % 360 or % (2*pi) in all relevant
operations on the angles.
--
"Codito ergo sum"
Roel Schroeven
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