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needed: exponential function with any a real (float) base
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needed: exponential function with any a real (float) base
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Senior Roboticist  Joined: Sat Mar 01, 2008 12:52 pm Posts: 936 Location: a small planet in the vicinity of Beteigeuze 
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 needed: exponential function with any a real (float) basehi to all,
I need an exponential function with any a real (floating point) base, similar to exp(x) with Euler's number (e) as a base, but with any a real base and with any a real exponent, e.g. 1,5^x 2^x e^x (=exp(x)) 3^x 10^x PI^e 
I know, there should be a math formula to converse exp(x) to any other real (float) base, but school maths are long gone... _________________ Ford Prefect Never purchase release 1.x ! (ancient programmer's wisdom) "Don't argue with idiots. They'll drag you down to their level and then beat you with experience." |
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| Tue Jul 29, 2008 6:00 pm |
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Rookie
Joined: Wed Jul 23, 2008 12:48 am Posts: 19 Location: Germany
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a^x = exp( x * log(a) )
with log being the natural logarithm Last edited by zeron on Wed Jul 30, 2008 6:01 am, edited 1 time in total. |
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| Wed Jul 30, 2008 3:43 am |
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Senior Roboticist Joined: Sat Mar 01, 2008 12:52 pm Posts: 936 Location: a small planet in the vicinity of Beteigeuze
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uuuh...yeah.
looks familiar 
thx a lot  _________________ Ford Prefect Never purchase release 1.x ! (ancient programmer's wisdom) "Don't argue with idiots. They'll drag you down to their level and then beat you with experience." |
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| Wed Jul 30, 2008 4:03 am |
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Rookie
Joined: Tue Aug 12, 2008 11:06 pm Posts: 2
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Re: needed: exponential function with any a real (float) base Does RobotC have an e^x function? Isn't exp(x) really 10^x in RobotC?
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| Tue Aug 12, 2008 11:09 pm |
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Senior Roboticist Joined: Sat Mar 01, 2008 12:52 pm Posts: 936 Location: a small planet in the vicinity of Beteigeuze
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Re: needed: exponential function with any a real (float) base
shock: I never doubted that exp(x) = e^x ! (edit:) but as Dick Swan wrote and as I could check, exp(x) = e^x and log(x)=ln(x) as it was supposed to be. _________________ Ford Prefect Never purchase release 1.x ! (ancient programmer's wisdom) "Don't argue with idiots. They'll drag you down to their level and then beat you with experience." Last edited by Ford Prefect on Wed Aug 13, 2008 9:26 am, edited 1 time in total. |
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| Wed Aug 13, 2008 2:57 am |
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Rookie
Joined: Tue Aug 12, 2008 11:06 pm Posts: 2
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Re: needed: exponential function with any a real (float) base Thanks for the quick response! I thought I had read somewhere that the exp(x) was something other than e^x.
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| Wed Aug 13, 2008 9:26 am |
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