topic Re: Conditional Constraint Syntax - Please Help in Mathematical Optimization, Discrete-Event Simulation, and OR

Conditional Constraint Syntax - Please Help

V12DBS — Sat, 31 Jan 2015 00:12:15 GMT

Hello,

I have a constraint that needs a conditional statement and not sure what are the syntax to handle in proc optmodel.

for all "i" in PickUpNode table, if "i" = Cary, NC then

sum{<s,d> in RouteTable: s=i} 1 * MS[s,d] = 1;

else

sum{<s,d> in RouteTable: s=i} 1 * MS[s,d] <= 1;

Thank You,

RobPratt — Sat, 31 Jan 2015 00:59:58 GMT

Assuming MS >= 0, here are three ways, in increasing order of compactness:

con Mycon {i in PickUpNode}:

(if i = 'Cary, NC' then 1 else 0)

<= sum{<s,d> in RouteTable: s=i} MS[s,d]

<= 1;

con Mycon {i in PickUpNode}:

(if i = 'Cary, NC' then 1 else 0)

<= sum{<(i),d> in RouteTable} MS[i,d]

<= 1;

con Mycon {i in PickUpNode}:

(i = 'Cary, NC')

<= sum{<(i),d> in RouteTable} MS[i,d]

<= 1;

You might find these examples useful:

V12DBS — Sat, 31 Jan 2015 05:12:17 GMT

Hi Rob,

Thanks so much for the help. I truly appreciate it. The constraint is working beautifully.

Regards,