How to calculate LOG10 in BASIC?

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3 total messages Started by Jan Nilsson Thu, 14 Jun 1990 08:12

#733

Author: Jan Nilsson
Date: Thu, 14 Jun 1990 08:12

20 lines
1085 bytes

Hello programmers!

Sorry to disturb You with a (I don't know if I dare say it..) BASIC
question. I want to calculate the common logarithm (LOG10) and BASIC 
only support LOG, the natural logarithm. Could it be calculated in 
another way?

Thanks

Janne 
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Re: How to calculate LOG10 in BASIC?

#745

Author: Kevin D. Quitt
Date: Thu, 14 Jun 1990 20:03

26 lines
1278 bytes

In article <7196.267754e0@eva.slu.se> jn@eva.slu.se (Jan Nilsson) writes:
>Hello programmers!
>
>Sorry to disturb You with a (I don't know if I dare say it..) BASIC
>question. I want to calculate the common logarithm (LOG10) and BASIC 
>only support LOG, the natural logarithm. Could it be calculated in 
>another way?
>

    Nothin' to do with BASIC.  All you need is a magic number:

0.4342944818 (log10 of e)

now, since the log10 of a = log10 of e * ln of a

et voila!


-- 
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Re: How to calculate LOG10 in BASIC?

#744

Author: Rich Winkel
Date: Thu, 14 Jun 1990 22:28

10 lines
881 bytes

In <7196.267754e0@eva.slu.se> jn@eva.slu.se (Jan Nilsson) writes:
>Hello programmers!
>Sorry to disturb You with a (I don't know if I dare say it..) BASIC
>question. I want to calculate the common logarithm (LOG10) and BASIC 
>only support LOG, the natural logarithm. Could it be calculated in 
>another way?

Divide by the natural log of 10 (2.30258) to get the common log.

Rich

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