Rounding a Number in a rule?

Setup, Configuration and Use Beginners
26

FWIW, I just struggled through a rounding-based issue so I thought I’d post it here.

I was trying to do a linear interpolation for setting my thermostat temperature based on a few different factors. However, I ultimately wanted to set it to a whole number, not a decimal, hence the rounding. Here’s what I ended up with:

var Number defaultSetPoint = SetPoint_F.state
var Number setPoint = AwaySetPoint_F.state
var Number outdoorTemp = OutdoorTemperature_F.state
var Number heatPumpCutoffHigh = 40
var Number heatPumpCutoffLow = 28

var multiplier = (heatPumpCutoffHigh - outdoorTemp) / (heatPumpCutoffHigh - heatPumpCutoffLow)

// this ends up being type BigDecimal
var setPointDec = sleepSetPoint + multiplier * (defaultSetPoint - sleepSetPoint)
setPoint = Math::round(setPointDec.floatValue())

sendCommand(Nest_temp_setpoint_f, setPoint)
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