[metapost] Statsmac barchart

[David Arnold]

Hi,

I'm using Anthony Phan's statsmac package. 

http://www-math.univ-poitiers.fr/~phan/

mps.tar.gz

I'm trying to do a barchart with categorical data. I've tried:

input statsmac;

data(poll)
	"Yes", 30,
	"No", 20,
	"Undecided", 50;

beginfig(0);

	usedata(poll, response$, n);
	setrange(0,3,5cm,0,50,3cm);
	weight reponse, n;
	barchart(response);
	
endfig;

end.

And:

input statsmac;

data(poll)
	"Yes","No","Yes","No","Yes","No","Yes","No";
	
beginfig(0);

	usedata(poll, response$);
	setrange(0,3,5cm,0,50,3cm);
	barchart(response);
	
endfig;

end.

But no luck. I'm struggling a bit with this as the manual mentions "When plotting a barchart of a non-numeric variable," but I can find no example of this in the disribution.

Has anyone tried this?

David.
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