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Topic: Is there a $log()? (Read 1055 times) previous topic - next topic
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Is there a $log()?

I checked the "Foobar2000:Title Formatting Reference" for the logarithm function, but it is not supported.  Does anyone know of a simple workaround?  I want to use it for a "View" in the "Album List" to view by duration.  For example, it could group files by durations of [n to 2*n) seconds -- 0 to 1 minute, 1 to 2 minutes, 2 to 4 minutes, 4 to 8 minutes, and so on.  (I realize that one could implement division with several $if statements, but that is complicated and does not scale).

Thanks!

Is there a $log()?

Reply #1 –
No, there are no exponential or logarithm functions. Note that all title formatting functions operate on integers only.

However, you can compute $floor($log10(x)) for a natural number x, even though neither a $floor nor a $log10 function actually exists. For this you have to compute the number of digits of the number which can be done with the $len function. Here is an example that applies this to the track length in minutes:
Code: [Select]
$puts(L,$len($div(%length_seconds%,60)))
1$repeat(0,$sub($get(L),1)) to $add(1$repeat(9,$sub($get(L),1)),1) minutes

This displays things like "10 to 20 minutes" or "1 to 2 minutes". Note that it will display the latter even for tracks shorter than 1 minute.

For maximum flexibility you have to resort to an $if cascade. Like you said this does not scale, but on the other hand you can choose the intervals freely. For example:
Code: [Select]
$ifgreater(%length_seconds%,599,
10 minutes or longer,
$ifgreater(%length_seconds%,179,
3 to 10 minutes,
$ifgreater(%length_seconds%,59,
1 to 3 minutes,
0 to 1 minute
)))
 

Is there a $log()?

Reply #2 –
Thanks for the reply, foosion.  I ended up going with your latter suggestion.  In case anyone else would benefit,

Code: [Select]
$ifgreater(%length%,3,$ifgreater(%length%,5,$ifgreater(%length%,10,$ifgreater(%length%,15,$ifgreater(%length%,30,$ifgreater(%length%,60,60:00 +,30:00 - 60:00),15:00 - 30:00),10:00 - 15:00),5:00 - 10:00),3:00 - 5:00),0:00 - 3:00)|$filename(%path%)