Utility lib for resolving virtual sensor's formulas.
Installation
npm install iwwa-formula-resolver --save
Usage
evaluateFormula
; const result = ;
formula
Object containing the formula to be resolved, aka:
formula: "(x+y+z)/2"
sensorsData
An array containing all objects data to be evaluated within the formula, aka:
symbol: "x" measurementValues: "1,2,3,4,5,6,7,9,10" measurementTimes: "1453939200000,1453939500000,1453939800000,1453940100000,1453940400000,1453940700000,1453941000000,1453941300000,1453941600000" ...
measurementDelta
Measurement sample delta (not mandatory, if not specified 300000)
decomposeFormula
; const result = ;
formula
Object containing the formula to be decomposed, aka:
formula: "(x-y-z)^3.2*x/totalizator(y)"
sensorsData
An array containing all objects id to be decomposed within the formula, aka:
symbol: "x" symbol: "y" ...
Custom operators
Following custom operators are provided:
- totalizator: returns the difference with the previous available value
- time shift: returns the value in the moment specified by the shifter
usage
; const formula = TOTALIZATOR + "(sensorX)*" + A_1D_FORWARD_SHIFT + "(sensorY)";const result = ;