[GAP Forum] Syntax error

[dmitrii.pasechnik at cs.ox.ac.uk]

Dear Angel,
On Fri, Jan 26, 2018 at 12:24:33PM +0100, Angel Blasco wrote:
> Dear forum, I'm a newbie user of GAP so this question maybe looks very
> simple. I've written a function and saved it into a text file called
> "ListaPrimos.g". I've tried to read it from GAP using Read command, and
> this is the output message:
> 
> 
> gap> Read("C:/gapListaPrimos/ListaPrimos.g");
> Syntax error: expression expected in C:/gapListaPrimos/ListaPrimos.g line 1
> ListaPrimos:=function(n)
> ^


It appears that you might have saved your function not as plain text,
but as some kind of rich text format. (Thus you see that weird <feff>
there)

Try saving it as plain text. (Perhaps in another editor...)

As well, you might also want to add

local primos, i;

as the 2nd line (GAP likes local variables to be declared).

HTH,
Dima

> 
> 
> 
> The function is:
> 
> ListaPrimos:=function(n)
> primos:=[];
> for i in [1..n] do
> if IsPrime(i) then
> Add(primos,i);
> fi;
> od;
> PrintTo("C:/primos.log",primos);
> Print(primos);
> Print("  Se han encontrado ",Length(primos)," primos entre 1 y ",n);
> end;
> 
> What is the expression expected?
> 
> Regards
> -- 
> *Angel Blasco.*
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