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  1. bleikur

    Getting [_G504] as a result...

    I see all the errors now and what the G_ result means... thanks!!! I guess I would get some help from a debugger. SWI-Prolog says it has one, but I don't manage to get it to work.
  2. bleikur

    Getting [_G504] as a result...

    Hi prologers, I don't know if this is kind of a basic question, but I cannot figure it out myself... The following program: %% 1.23 (**) Extract a given number of randomly selected elements from a list. %% Signature: %% - select(Output, HowMany, Input). select(Output, HowMany,Input) :-...
  3. bleikur

    N > 1 -> Arguments are not sufficiently instantiated

    Thanks, joel76 :) And sorry for my bad explanation. Compressifpossible calls compress, but compressifpossible is called by: encode2([],[]). encode2([X|Xs], [Y|Ys]) :- compressifpossible(X, [Y|Ys], Zs), encode2(Xs, Zs). So actually I meant that I call it by asking encode2(..) and not...
  4. bleikur

    N > 1 -> Arguments are not sufficiently instantiated

    Hi Prologers! I am quite new to prolog, learning just for fun. I kind of get how it works, but I just found an issue I cannot figure out myself. The following program runs without problem (based on compress that also runs ok). compressifpossible(X, [X|Xs], Zs) :- compress([1,X], [X|Xs], Zs)...

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