why does card() work?

[Ian Downes]

I'm not quite sure what I'm doing wrong but card() doesn't work like
I'd expect, could someone please tell me what I'm missing here....

thanks - Ian

[2143][ian@weta:~]$ ampl -v
AMPL Student Version 20090726 (Linux 2.6.25.20-0.4-pae)

[2143][ian@weta:~]$ ampl
ampl: set A = {1..10};
ampl: display A;
set A := 1 2 3 4 5 6 7 8 9 10;

ampl: card(A);

syntax error
context: >>> card( <<< A);
ampl:

[Paul]

There's nothing wrong with the card() function; your last statement is
syntactically incomplete. Try

ampl: display card(A);

or

ampl: param c := card(A);
ampl: display c;

etc.

/Paul

[Ian Downes]

sorry I meant, why doesn't it work as expected?

[Paul]

On Nov 10, 1:14 am, Ian Downes <ian.dow...@gmail.com> wrote:
> sorry I meant, why doesn't it work as expected?
>

I suppose that comes down to what you were expecting. Given a set S,
card(S) returns the cardinality of the set. In what way is that not
as expected?

/Paul

[Paul]

Sorry -- if your last post was just to change the subject line, then
you can ignore this.

[Ian Downes]

Paul,

thanks - I was just getting confused as to what the syntax error was referring to, I'm just getting used to ampl and requiring either a display or an assignment.

Ian

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