[PD] [until] ceiling

[cyrille henry]

well, 5^12 is in the range of the value represented by a float number. but at this value, the precision is more than 1, so it's can be computed directlly, but not with single iteration.

I guess wikipedia will explain it in more detail than what I can do in a mail.
https://en.wikipedia.org/wiki/Floating-point_arithmetic
more specifically :
https://en.wikipedia.org/wiki/Floating-point_arithmetic#Range_of_floating-point_numbers
https://en.wikipedia.org/wiki/Floating-point_arithmetic#Accuracy_problems

cheers
c

Le 26/04/2018 à 09:57, hans w. koch a écrit :
> thanks, cyrille,
> 
> but why does the computation for 5pow12 [print start] in my patch then still produce 2.44141e+08?
> or 5pow12 - 4pow12 work?
> (see attached)
> 
> cheers hans
> 
> 
> 
> 
>> Am 26.04.2018 um 09:46 schrieb cyrille henry <ch at chnry.net>:
>>
>> hello,
>>
>> this is not a probem with until, but a problem of big number precision.
>> see attachment.
>> cheers
>> c
>>
>>
>> Le 26/04/2018 à 09:30, hans w. koch a écrit :
>>> dear miller,
>>> all
>>> for a project i am working with very high number of iterations.
>>> but it seems i´ve literally hit a ceiling with [until]
>>> for 4pow12 iterations it performs fine.
>>> but 5pow12 doesn´t.
>>> feeding it into a counter,  5pow12 produces the same result as 4pow12.
>>> attached a small patch to demonstrate.
>>> is this limitation by purpose?
>>> (i have a workaround not using [until], but wanted to make sure i didn´t overlook something)
>>> thanks
>>> hans
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