[eclipse-users] Error in bin packing example

Hi folks,

 

I am trying the bin packing example from the tutorial, and I'm getting
the following

error:

 

calling an undefined procedure constrain_bin(Bin) in module eclipse

 

I typed in the example, got the error, then made a new .pl file in which
I copied the

code from the PDF of the tutorial in case I had made manual typos, but I
get the

same result.

 

It seems to be complaining about the first predicate in the second
clause defining

bin_setup/2 below: 

 

bin_setup(Demand,[]) :-

all_zeroes(Demand).

 

bin_setup(Demand, [Bin | Bins]) :-

constrain_bin(Bin),

reduce_demand(Demand, Bin, RemainingDemand),

bin_setup(RemainingDemand, Bins).

 

constrain_bin/3 is defined like this:

 

constrain_bin(bincolour:Col, capacity:Cap, contents:C) :-

colour_capacity_constraint(Col, Cap),

capacity_constraint(Cap, C),

contents_constraints(C),

colour_constraints(Col, C).

 

Since the call within bin_setup/2 only has one parameter ("Bin"), is
this the problem?

 

Thanks,

 

Chuck Lutz

Lockheed Martin

Systems of Systems Engineering

BMC4I Modeling and Simulation

Moorestown, NJ

(856)638-7234 (office)

charles.d.lutz_at_lmco.com

 

"A graphic is never an end in itself; it is a moment

in the process of decision making."
     - Jacques Bertin