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Is there a command to return the index of an element if it exists in a list or array?

CADcasualty

Hopefully a quickie (and I did search the documentation beforehand). I'm looking for a command that will take an array (preferred) or list and an object return the index of the object if it exists in the array or list. I know I can use e.g. the member function and do a subtraction between the lengths of the original and member lists, but I was hoping there was a native command that just did what I was after. Ideally the command would look like:

myList = list(1 2 "ab" "ef" 1.234)  

some_function("ef" myList)  would return 3  (i.e. nth(3 myList) yields "ef")

  • AaronSymko

    I believe what you want is the "lindex" function:

    The lindex function returns the index number of the given element in a list.
    lindex(l_list g_element) returns nil if the given element is not present in the list.

    Examples:
    lindex('(1 2 3 4) 2) => 2
    lindex('(1 6 4 5) 4) => 3
    lindex('(1 4 6 7) 3) => nil

  • Andrew Beckett
    in reply to AaronSymko

    beat me to it ;-)

    Note that the index is in a form that is suitable for use by nthelem not nth (so it's 1-indexed rather than 0-indexed - i.e. US floor numbering rather than European!). That said, any time you find yourself using nth/nthelem, you should always ask "should I be doing this?" (see my Writing Good SKILL Code video)

    I don't believe there's an equivalent function for arrays/vectors. Probably worth requesting an aindex or vindex function...

    Andrew.

  • CADcasualty

    So what took you guys so long ;-) ...

    (and thanks!)

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