This just comes down to math:

You can calculate the log of any base if you have log of any other base.
4D has the command Log (which is a natural log based on e… 2.718 etc). We can 
use it to convert logs to any base.

If you want log base 10 do the following:

$x:=100
$log:=Log($x)/Log(10)
ALERT(String($log))

$log will be 2 as expected


If you wanted base 3 log

$x:=81
$log:=Log($x)/Log(3)
ALERT(String($log))

$log will be 4 as expected


Neil

> On Jun 29, 2022, at 3:09 PM, stardata.info via 4D_Tech <[email protected]> 
> wrote:
> 
> Hi All,
> 
> I need to calculate a logarithm on base 10 of one number.
> 
> Someone know tha 4D Command that i can use?
> 
> Thanks
> 
> Ferdinando
> 
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