How do I put intervals in my functions ?

GAMS
1

Variables m, p0, p1, p2, p3;
Equations funct, eq0, eq1, eq2;
funct… m =e= +1p0 +1p1 +1p2 +1p3;
eq0… + 0p0 + 0p1 + 1p2 + 1p3 =e= 0.5;

eq1… + 0p0 + 1p1 + 0p2 + 1p3 =e= 0.5;

eq2… 0 =g= + 1p0 + 1p1 + 1p2 + 1p3 =l= 1 ;

The gams cant solve this program, how could I program problems with statements like 0 <= x <= 1 in GAMS language ?

–
To post to this group, send email to gamsworld@googlegroups.com.
To unsubscribe from this group, send email to gamsworld+unsubscribe@googlegroups.com.
For more options, visit this group at http://groups.google.com/group/gamsworld?hl=en.

2

I think that you should write two equations for the constraints like 0 wrote:

Variables m, p0, p1, p2, p3;
Equations funct, eq0, eq1, eq2;
funct… m =e= +1p0 +1p1 +1p2 +1p3;
eq0… + 0p0 + 0p1 + 1p2 + 1p3 =e= 0.5;

eq1… + 0p0 + 1p1 + 0p2 + 1p3 =e= 0.5;

eq2… 0 =g= + 1p0 + 1p1 + 1p2 + 1p3 =l= 1 ;

The gams cant solve this program, how could I program problems with statements like 0 <= x <= 1 in GAMS language ?

–
To post to this group, send email to gamsworld@googlegroups.com.
To unsubscribe from this group, send email to gamsworld+unsubscribe@googlegroups.com.
For more options, visit this group at http://groups.google.com/group/gamsworld?hl=en.

\

To post to this group, send email to gamsworld@googlegroups.com.
To unsubscribe from this group, send email to gamsworld+unsubscribe@googlegroups.com.
For more options, visit this group at http://groups.google.com/group/gamsworld?hl=en.

3

Lucas:



The simplest is to add an extra variable, revise eq2, and put bounds on the new variable:



Variable temp; temp.lo = 0; temp.up = 1;



eq2… temp =E= + 1p0 + 1p1 + 1p2 + 1p3;



Good luck



Arne

Arne Stolbjerg Drud

ARKI Consulting & Development A/S

Bagsvaerdvej 246A, DK-2880 Bagsvaerd, Denmark

Phone: (+45) 44 49 03 23, Fax: (+45) 44 49 03 33, email: adrud@arki.dk



From: gamsworld@googlegroups.com [mailto:gamsworld@googlegroups.com] On Behalf Of Lucas Ianni
Sent: Monday, August 13, 2012 7:56 PM
To: gamsworld@googlegroups.com
Subject: How do I put intervals in my functions ?



Variables m, p0, p1, p2, p3;

Equations funct, eq0, eq1, eq2;

funct… m =e= +1p0 +1p1 +1p2 +1p3;

eq0… + 0p0 + 0p1 + 1p2 + 1p3 =e= 0.5;



eq1… + 0p0 + 1p1 + 0p2 + 1p3 =e= 0.5;



eq2… 0 =g= + 1p0 + 1p1 + 1p2 + 1p3 =l= 1 ;



The gams cant solve this program, how could I program problems with statements like 0 <= x <= 1 in GAMS language ?

–
To post to this group, send email to gamsworld@googlegroups.com.
To unsubscribe from this group, send email to gamsworld+unsubscribe@googlegroups.com.
For more options, visit this group at http://groups.google.com/group/gamsworld?hl=en.

–
To post to this group, send email to gamsworld@googlegroups.com.
To unsubscribe from this group, send email to gamsworld+unsubscribe@googlegroups.com.
For more options, visit this group at http://groups.google.com/group/gamsworld?hl=en.

4

thanks for the answers!

I am going to try Arne`s solution, sounds easier! haha


2012/8/14 Arne Stolbjerg Drud

Lucas:



The simplest is to add an extra variable, revise eq2, and put bounds on the new variable:



Variable temp; temp.lo = 0; temp.up = 1;



eq2… temp =E= + 1p0 + 1p1 + 1p2 + 1p3;



Good luck



Arne

Arne Stolbjerg Drud

ARKI Consulting & Development A/S

Bagsvaerdvej 246A, DK-2880 Bagsvaerd, Denmark

Phone: (+45) 44 49 03 23, Fax: (+45) 44 49 03 33, email: adrud@arki.dk



From: gamsworld@googlegroups.com [mailto:gamsworld@googlegroups.com] On Behalf Of Lucas Ianni
Sent: Monday, August 13, 2012 7:56 PM
To: gamsworld@googlegroups.com
Subject: How do I put intervals in my functions ?



Variables m, p0, p1, p2, p3;

Equations funct, eq0, eq1, eq2;

funct… m =e= +1p0 +1p1 +1p2 +1p3;

eq0… + 0p0 + 0p1 + 1p2 + 1p3 =e= 0.5;



eq1… + 0p0 + 1p1 + 0p2 + 1p3 =e= 0.5;



eq2… 0 =g= + 1p0 + 1p1 + 1p2 + 1p3 =l= 1 ;



The gams cant solve this program, how could I program problems with statements like 0 <= x <= 1 in GAMS language ?

–
To post to this group, send email to gamsworld@googlegroups.com.
To unsubscribe from this group, send email to gamsworld+unsubscribe@googlegroups.com.
For more options, visit this group at http://groups.google.com/group/gamsworld?hl=en.

–
To post to this group, send email to gamsworld@googlegroups.com.
To unsubscribe from this group, send email to gamsworld+unsubscribe@googlegroups.com.
For more options, visit this group at http://groups.google.com/group/gamsworld?hl=en.

\

To post to this group, send email to gamsworld@googlegroups.com.
To unsubscribe from this group, send email to gamsworld+unsubscribe@googlegroups.com.
For more options, visit this group at http://groups.google.com/group/gamsworld?hl=en.