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Re: [Help-gsl] logic error logarithms


From: Thomas Weber
Subject: Re: [Help-gsl] logic error logarithms
Date: Wed, 18 Jan 2006 21:49:17 +0100

HI,

Am Mittwoch, den 18.01.2006, 08:19 -0800 schrieb yperez_riverol (sent by
Nabble.com):

> I want calculate logarithms base 2 of x.
> for this my code is:
> 
> result = (gsl_sf_log(x)/gsl_sf_log(2));
First guess: result is an integer (which explains why you get 6 and not
6.6439)

> when x=100 the logic result=2, but the program show me 6.
Huh? The log2 of 100 is the number y, which fulfills
2^y = 100.

So y=2 is quite obviously not the correct solution (unless you have a
very special logic).

Regards
        Thomas





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