Cycling '74

log-to-the-base-x

jimdrake wrote on Wed, 10 June 2009 14:20

have you tried typing "log" into an object box yet?

jimdrake wrote on Wed, 10 June 2009 14:20how to i do log to the base x in max?

have you tried typing "log" into an object box yet?


Look at the [expr] object and reference. There's a log10 function and a log (natural log) function. The syntax is standard C, so any C reference will point you in the right direction if you can't figure it out by trial and error.

i hunted around and i can't see anything in C that lets you do log to the base x.

i did however dig out a text book from uni (!) and found this useful rule:

so, i can do it in [expr] with log to the base 10

jimdrake wrote on Wed, 10 June 2009 16:09

for other ranges just scale before and after.

frustrating, that expierience when typing "log" into an

jimdrake wrote on Wed, 10 June 2009 16:09i hunted around and i can't see anything in C that lets you do log to the base x.

so, i can do it in [expr] with log to the base 10 

frustrating, that expierience when typing "log" into an
object box, isnt it?

...and if you want to include the input range into the

formula, you might end up with something like this:


[expr ((log((($f1-$f2)/($f3-$f2))*($f4-1)+1)/log($f4))*($f3-$f2))+$f2]


where $f2 $f3 are range low range high, and $f4 is the base.

...and if you want to include the input range into the
formula, you might end up with something like this:

where $f2 $f3 are range low range high, and $f4 is the base.
