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  3. Trying to count string members in a list

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Trying to count string members in a list

David M Gonzales
David M Gonzales over 4 years ago

I have a list that has 4 strings as members.

Example...    ( "X"  "X"  "Y"  "Y" )

Is there a way to obtain the results

X = 2

Y = 2

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  • DavidJHutchins
    DavidJHutchins over 4 years ago

    procedure(CountItems2(lst)
    let((x c r tbl)
    (tbl = makeTable("tbl" 0))
    (while lst
    (x =(car lst))
    if( tbl[x] then
    tbl[x] = add1(tbl[x])
    else
    tbl[x] = 1;
    )
    (lst = cdr(lst))
    )
    foreach(val tbl
    printf("%L = %d\n" val tbl[val])
    )
    )
    )

    > (CountItems2 '("A" "B" "C" "A" "A" "C"))
    "C" = 2
    "A" = 3
    "B" = 1
    table:tbl

    >

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  • David M Gonzales
    David M Gonzales over 4 years ago in reply to DavidJHutchins

    Thanks a lot. Works perfect!

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