Doing math with a variable when writing to log?

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I have a simple rule:
WHEN something THEN log "Woonamer opgewarmd van $OldTemp naar $WoonkamerTemperatuur in $pellet-timer.time"
How can I change this in something like:
WHEN something THEN log "Woonamer opgewarmd van $OldTemp naar $WoonkamerTemperatuur in ($pellet-timer.time / 60) "

If this does not work, i wouldt make a variable that contains $pellet-timer.time / 60

You can make a variabel where you put the result of $pellet-timer.time / 60. Like $pellet-timer-calc = ($pellet-timer.time / 60) and then use the $pellet-timer-calc variable in the rule instead.

Ups… already mentioned by Michael…

Of course, that’s a workaround. But based on the reactions it looks like it’s not possible?

Seems that is the only way. Tried some variants in this moment but nothing worked…

@koffienl said in Doing math with a variable when writing to log?:

How can I change this in something like:
WHEN something THEN log "Woonamer opgewarmd van $OldTemp naar $WoonkamerTemperatuur in ($pellet-timer.time / 60) "

Did you try the following?

WHEN something THEN log "Woonamer opgewarmd van $OldTemp naar $WoonkamerTemperatuur in {$pellet-timer.time / 60}"

Works for me, at least. See also docs on string expressions - https://pimatic.teamemo.com/Usage/Functions-for-Variables-and-Rules

@mwittig said in Doing math with a variable when writing to log?:

@koffienl said in Doing math with a variable when writing to log?:

How can I change this in something like:
WHEN something THEN log "Woonamer opgewarmd van $OldTemp naar $WoonkamerTemperatuur in ($pellet-timer.time / 60) "

Did you try the following?

WHEN something THEN log "Woonamer opgewarmd van $OldTemp naar $WoonkamerTemperatuur in {$pellet-timer.time / 60}"

Works for me, at least. See also docs on string expressions - https://pimatic.teamemo.com/Usage/Functions-for-Variables-and-Rules

Thanks!
I tried () and [] but never thought of {}