CODEWITHSUNDEEP
erlangerlang-shell
Scatman_John
Scatman_John

Reputation: 107

Can't figure out why Erlang function is undefined

I have a function that keeps giving me "function codes/3 undefined" error. Here is the code for the function:

table(Sample)->
Freq=freq(Sample),
Tree = huffman(lists:keysort(2, Freq)),
codes(Tree).

codes(Tree)->
    {_,_,X,_}=Tree, <---- Masks out a tuple
    {Y,_,_,_}=Tree, <----- Masks out an atom
    codes(X,Y,[]). <------ Here is where it gives error.

codes({},_,List)->List;
codes(Entry,Type,List)->
    case Type of
        leaf->
            NewList=[element(3,Entry)|List];
        node->
            Entry1=element(2,Entry),
            Entry2=element(2,Entry),
            codes(Entry1,element(1,Entry1),List),
            codes(Entry2,element(1,Entry2),List);
    end.

Can't figure out why, does anyone know?

EDIT: the problem was a ; after the final end rather than a ., now fixed.

Upvotes: 1

Views: 1008

Answers (1)

ripudaman flora
ripudaman flora

Reputation: 25

Even though someone else solved the question, below is the structure from the erlang

case Expr of
    Pattern1 [when GuardSeq1] ->
        Body1;
        ...;
    PatternN [when GuardSeqN] ->
        BodyN
end

Upvotes: 1

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