Re: Not a function in function call

[Hans L <thehans@gmail.com>]

I thought maybe assigning a new name to Str function would help, but
it seems Str is defined in some bizarre way where it can't be
referenced without calling it?

? f=Str
%1 = ""
? Str
%2 = ""
? Str==Str()
%3 = 1

As opposed to abs for example:

? f=abs
%1 = abs
? abs
%2 = abs
? f(-1)
%3 = 1
? abs==abs()
  ***   too few arguments: abs==abs()
  ***                               ^-
? abs==abs(-1)
%4 = 0

On Wed, Mar 4, 2020 at 2:29 PM Hans L <thehans@gmail.com> wrote:
>
> Not sure if this is any relation, but I'm seeing the same error on a
> much simpler test case:
>
> ? ?Str
> Str({x}*): concatenates its (string) argument into a single string.
>
> ? Str(1,2,3,4)
> %1 = "1234"
>
> ? ?call
> call(f, A): A being a vector, evaluates f(A[1],...,A[#A]).
>
> ? call(Str, [1,2,3,4])
>   ***   at top-level: call(Str,[1,2,3,4])
>   ***                 ^-------------------
>   *** call: not a function in function call
>   ***   Break loop: type 'break' to go back to GP prompt
>
> I would expect this to return the same as Str(1,2,3,4)
> Is this a bug or is there some nuance to using "call" that I'm not
> understanding?
>
> I get this error in gp 2.9.4 from ubuntu repos, and also 2.12.0
> (alpha) , which built from source on Aug 17 2019.
>
> Thanks,
> Hans
>
>
> On Tue, Jan 28, 2020 at 7:57 AM Bill Allombert
> <Bill.Allombert@math.u-bordeaux.fr> wrote:
> >
> > On Tue, Jan 28, 2020 at 11:31:52AM +0000, Predrag Terzic wrote:
> > > But, this one doesn't :
> > >
> > > n=22;
> > > prevprime(k)={p=1;while(p<k,r=p;p=nextprime(p+1));return(r);}
> > > compositorial(n)={c=10;l=[];forcomposite(i=1,n,c=c*i;l=concat(l,[c-prevprime(c-1)]));return(l);}
> >
> > Why not use the GP function precprime instead of prevprime ?
> >
> > > How to fix this problem?
> >
> > I assume prevprime take too much time.
> >
> > Cheers,
> > Bill
> >