Dedicated SF operation ivscc_apfrequency

[t-b]

From #2565 (comment):

We would like to have a convenience SF operation ivscc_apfrequency which does basically

sel = select(selsweeps(), selstimset("*rheo*", "*supra*"), selvis(all))

selexpA = select(selexp("*.10A.*"), $sel, selchannels(AD0), selrange(E1))

selexpB = select(selexp("*.10B.*"), $sel, selchannels(AD0), selrange(E1))

selDAA = select(selexp("*.10A.*"), $sel, selchannels(DA0), selrange(E1))

selDAB = select(selexp("*.10B.*"), $sel, selchannels(DA0), selrange(E1))

freqA = apfrequency(data($selexpA))

currentA = max(data($selDAA))
currentANorm = $currentA - extract($currentA, 0)

freqB = apfrequency(data($selexpB))

currentB = max(data($selDAB))
currentBNorm = $currentB - extract($currentB, 0)


$freqA

vs

$currentA - extract($currentA, 0)

with

$freqB 

vs 

$currentB - extract($currentB, 0)

with

avg([$freqA, $freqB], sweepgroup)

vs

avg([$currentANorm, $currentBNorm], sweepgroup)

internally.

The only arguments it should take are related to plotting:

• offset for each axis: min, max, none
• percentage option for each axis, with it turned on we would span the data range from 0% to 100%

If I understand the above example correct, we would selexpXXX, selDAXXX, freqXXX, currentXXX for each experiment. @timjarsky Does that make sense?

[t-b]

• Refactor SF_FormulaPlotter to evaluate all formulas (vs/with/and) first and separately -> Separate PR
• Introduce an SF operation tag which allows SF operations to already ship formulas for vs/with/and
• Define wref-based tree format for storing formula data
  • vs: max. 2 elements
  • with: n elements
  • and: n elements
• Add operation ivscc_apfrequency([xaxisOffset, yaxisOffset, xAxisPercentage, yAxisPercentage]) where [] denotes that the parameters are optional.
• ivscc_apfrequency:
  • Add generic interface to add variables from an operation
    and be able to use these variables from an SF_ExecuteFormula call. We want to use only one global variable storage.
  • Collect all experiment names in SF variable
  • Add variables for selexpXXX, selDAXXX, freqXXX, currentXXX
  • Offset:
    • min: $currentXXX - extract($currentXXX, 0)
    • max:$currentXXX - maxSpecial($currentB)
    • none:$currentXXX
  • percentage: Should be scaled for each experiment