Editing items in a list

[Anonymous]

Hi All,

I am tyring to edit a mulitilevel/multiDimensional list but I am getting a compile error.

What I am trying to do is;

   1. to generate a list of parameters for listed children

   2. edit the created list based on a few conditional checks

Now the list is created and is working fine, but when I want to edit an item in the list; I am getting the comlie error.

Here's what my rule looks like:

Rule lstPreStdPanels As List

    Dim panelCounter As Integer

    'loop to create the panel parameters list

    For panelCounter = 1 To intNoStdPanels

        lstPreStdPanels = lstPreStdPanels + {{ _

        ":origin", Point(panelCounter * StdPanelLength,0,0), _

        ":xDirection", Vector(0, -1, 0), _

        ":yDirection", Vector(-1, 0, 0), _

        ":panel_length" , StdPanelLength }}

    Next

    Dim openingCounter As Integer

    'Loop through the opening list to check if need changed length

     For openingCounter = 1 To length ( lstOpeningList )

        If nth (5, nth( openingCounter , lstOpeningList ) ) = "T" Then

            For panelCounter = 1 To intNoStdPanels

                'Determine the target panels

                If GetX(Second(nth(panelCounter,lstPreStdPanels)) >50 Then

                   'nth(8, nth( panelCounter, lstPreStdPanels ) ) = 5

                End If

            Next' panel counter

        EndIf' If opening List = T

    Next' openings counter

End Rule

I am getting the error on the commented line.

I could try to place the conditional checks as the list is generated, but I have more that one conditions which are themself in a loop (in contrast to this sample code).

All help is appreciated.

Thanking you,

Wajih

[Anonymous]

Hello,

Editing an element of a list is not possible in the intent language as you have shown.  I have worked around this before by creating a replaceItem function which takes a list, an element index, and a newValue and essentially splits the originally list at the index, excluding the item to replace and builds a new list inserting the newValue between the start and end pieces of the two parts of the list.

[Anonymous]

Could you please post/attach the function/snippet.

Trying to accomplish what I had asked has exhausted: I am out ideas.
A fresh perspective would be a re-boot.

Thanking you,

Wajih

[Anonymous · Accepted solution]

Here is a method that I wrote which replaces an item in a list by index.

Method ReplaceItemInList(inputList As List, indexOfItemToReplace As Integer, newValue As Any) As List
     Dim lowerList As List = {}
     Dim upperList As List = {}

     If indexOfItemToReplace > 1 Then
          lowerList = subList(inputList, 1, indexOfItemToReplace -1)
     End If

     If indexOfItemToReplace < length(inputList) Then
          upperList = subList(inputList, indexOfItemToReplace + 1, length(inputList))
     End If

     Return lowerlist + {newValue} + upperList
End Method