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Replace list elements based on input criteria

MorrisDH

Example input to the function is a string  "0.0 0.12u -0.12u 0.18u".

What I need is something that will replace any value below 0 with 0 and replace any value above a given maximum to the maximum. For example, if the given maximum in 0.16u then the above example input should return "0.0 0.12u 0.0 0.16u".

I made it work with the following but I'm wondering if there is a better way.

input = "0.0 0.12u -0.12u 0.18u"

threshold = "0.16u"

listInput = parseString(input)

newList = list()

foreach(element listInput
  if(evalstring(element) > evalstring(threshold) element = threshold)
  if(evalstring(element) < 0 element = "0.0")
  newList = append1(newList element)
)

Parents

  • For a start, do not use evalstring for this. It's a bad idea - because if your string happened to contain SKILL function calls, it will execute them.

    I would use a foreach mapcar and generalise like this:

    procedure(CCFlimitStringList(strNumList lower upper "ttt")
  let((num (lowerNum aelNumber(lower)) (upperNum aelNumber(upper)))
    buildString(
      foreach(mapcar elem parseString(strNumList)
        num=aelNumber(elem)
        cond(
          (num<lowerNum lower)
          (num>upperNum upper)
          (t elem)
        )
      )
    )
  )
)

    Then you can use:

    CCFlimitStringList("0.0 0.12u -0.12u 0.18u" "0.0" "0.16u")

    I'm using aelNumber; if this was going to be for use in a PCell, then cdfParseFloatString might be a better alternative. Or even num=car(linereadstring(elem))

    Andrew

Reply

  • For a start, do not use evalstring for this. It's a bad idea - because if your string happened to contain SKILL function calls, it will execute them.

    I would use a foreach mapcar and generalise like this:

    procedure(CCFlimitStringList(strNumList lower upper "ttt")
  let((num (lowerNum aelNumber(lower)) (upperNum aelNumber(upper)))
    buildString(
      foreach(mapcar elem parseString(strNumList)
        num=aelNumber(elem)
        cond(
          (num<lowerNum lower)
          (num>upperNum upper)
          (t elem)
        )
      )
    )
  )
)

    Then you can use:

    CCFlimitStringList("0.0 0.12u -0.12u 0.18u" "0.0" "0.16u")

    I'm using aelNumber; if this was going to be for use in a PCell, then cdfParseFloatString might be a better alternative. Or even num=car(linereadstring(elem))

    Andrew

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