Search found 56 matches

by Manassaldi
1 month ago
Forum: Modeling
Topic: converting an integer variable into a binary variable
Replies: 2
Views: 251

Re: converting an integer variable into a binary variable

Hi, try these equations:

eq.. X =l= M*Y
eq.. X =g= Y

M is a parameter and the upper bound of X

If Y =1
X =l= M
X =g= 1

if Y = 0
X =l= 0
X =g= 0

Bye!
by Manassaldi
2 months ago
Forum: Syntax
Topic: logical equations & binary variables
Replies: 11
Views: 654

Re: logical equations & binary variables

Hi, To avoid taking the first element, in my opinion, it is preferable to use this code:

e_T_pi(i)$(ord(i) gt 1) .. T_pi(i)*(m_rc_pb(i)+m_ts_pb(i)) =e= (m_rc_pb(i)*T_ro + m_ts_pb(i)*T_to(i));

Bye!
by Manassaldi
2 months ago
Forum: Syntax
Topic: logical equations & binary variables
Replies: 11
Views: 654

Re: logical equations & binary variables

Hi, In another post I suggested this equation

e_T_pi(i+1) .. T_pi(i+1)*(m_rc_pb(i+1)+m_ts_pb(i+1)) =e= (m_rc_pb(i+1)*T_ro + m_ts_pb(i+1)*T_to(i+1));
by Manassaldi
2 months ago
Forum: Syntax
Topic: logical equations & binary variables
Replies: 11
Views: 654

Re: logical equations & binary variables

Hi, the equation listing and column Listing shows the value on the initial point, not in the solution. The equations are fine.
You should review the SolEQU and SolVAR section.
Bye!
by Manassaldi
2 months ago
Forum: Syntax
Topic: logical equations & binary variables
Replies: 11
Views: 654

Re: logical equations & binary variables

Hi, It's similar

eq1.. m =g= m.lo*(1-x);
eq2.. m =l= m.up*(1-x)

Bye!
by Manassaldi
2 months ago
Forum: Syntax
Topic: logical equations & binary variables
Replies: 11
Views: 654

Re: logical equations & binary variables

Hi, try these equations

eq1.. m =g= m.lo*x;
eq2.. m =l= m.up*x;

m.lo (lower bound)
m.up (upper bound)

if x=1
m greater than m.lo*1;
m lower than m.up*1
if x=0
m greater than m.lo*0;
m lower than m.up*0;
so, m = 0

Bye!
by Manassaldi
2 months ago
Forum: Syntax
Topic: Synthax of binary variables
Replies: 3
Views: 328

Re: Synthax of binary variables

I think this can work. I do not understand why you use (i + 1) instead of (i) e_T_pi(i+1) .. T_pi(i+1)*(m_rc_pb(i+1)+m_ts_pb(i+1)) =e= (m_rc_pb(i+1)*T_ro + m_ts_pb(i+1)*T_to(i+1)); If you want to avoid the first value of i, you can use this equation. e_T_pi(i)$(ord(i) ne 1).. T_pi(i)*(m_rc_pb(i)+m_t...
by Manassaldi
2 months ago
Forum: Modeling
Topic: Ensuring realations between decision variables
Replies: 6
Views: 818

Re: Ensuring realations between decision variables

Hi Peter, I think that with the auxiliary variable "on(t)" can work. If on(t)=1 x(t) or y(t) = 1 If on(t)=0 x(t) and y(t) = 0 eq1(t).. x(t) + y(t) =l= 1; eq2(t).. 1-on(t) + x(t) + y(t) =g= 1; eq3(t).. on(t) + 1-x(t) =g= 1; eq4(t).. on(t) + 1-y(t) =g= 1; eq5(t,tp)$(ord(t) gt 1 and ord(tp) gt ord(t) a...
by Manassaldi
2 months ago
Forum: Syntax
Topic: Synthax of binary variables
Replies: 3
Views: 328

Re: Synthax of binary variables

e1_npb(i) .. m_pb_rc(i) =l= (1-npb(i) )*M;
e2_npb(i) .. m_pb_ts(i) =l= (1-npb(i) )*M;

With these equations when npb(i) take the value of 1, m_pb_rc (i) and m_pb_ts (i) are 0.
I can not understand the idea of the problem but this may help you.
Best
by Manassaldi
2 months ago
Forum: Syntax
Topic: logical condition with equation definitions and variables
Replies: 4
Views: 405

Re: logical condition with equation definitions and variables

Hi, the equations can not vary during the resolution. To relate variables or take logical decisions you will need to use binary variables.
Best!