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Geek Culture / Explination of exponentials (a^b) when b is a float

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Killswitch
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Location: School damnit!! Let me go!! PLEASE!!!
Posted: 23rd Mar 2006 22:50 Edited at: 23rd Mar 2006 22:50
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I'm writing an algorithm to work out exponentials in ASM. So far I've managed to get code working for when a and b (a^b) are integers and when a is a float. I don't really know what to do when b is a float. when it's an integer the process is quite simple:

a=a*a ;repeat b-1 times

What do I do when b is a float (i.e. 2.1)?

~Heed my word hobags: Jism~
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Saikoro
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Posted: 23rd Mar 2006 23:13
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Try rewriting it to use fractional exponents. Say you had 2.3333, you could write that as 7/2, and with the formant m/n, do the nth root of a then to the power of m.

I think this would work, I could be wrong though.

And the meek shall inherit the Earth...
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QuothTheRaven
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Posted: 24th Mar 2006 06:05 Edited at: 24th Mar 2006 06:06
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This problem was posted in my Discreet Math class, why on a calculator if you input 2^1.5 you get an answer but if you input 2^1.6 you get an error. I'm telling you now that you're waisting your time trying to raise a number to a float. If you raise to a multiple of .5 then there's some stupid formula that you can do with pi, otherwise you have to do some batsh*t insane math. It's simply not neccessary for normal calculators.

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Perokreco
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Posted: 24th Mar 2006 10:06
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Well, 2.15=2+0.15=2+15/100=215/100= 100th root to the power of 215
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Killswitch
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Posted: 24th Mar 2006 12:41
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The nth root/m power method is good - and works - but it's too hard for me to convert into ASM. I guess it'll have to be a limiation .

Thanks for the suggestions!

~Heed my word hobags: Jism~
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