using power inside of sum

GAMS
1

Hi,

I have two vectors of decision variables that i want to use in my objective function to calculate the Euclidean distance between them:

I write this: sqrt(sum(j, power(v1(j) - v2(j)),2))

And i get an error because the domain changes. I understood that when i am using the power function inside the sum it’s calculating a new value that is not over the domain j.

So is there a way to do this in GAMS in the same step, or over multiple steps?

Thanks,
Sara

–
To unsubscribe from this group and stop receiving emails from it, send an email to gamsworld+unsubscribe@googlegroups.com.
To post to this group, send email to gamsworld@googlegroups.com.
Visit this group at http://groups.google.com/group/gamsworld.
For more options, visit https://groups.google.com/d/optout.

2

Hi Sara

You could just add an equation:



Eq_power…

SUMPOW =E= sum(j, power(V1(j) - V2(j)),2);



Eq_obj…

OBJ =E= sqrt(SUMPOW);

Cheers

Renger



From: gamsworld@googlegroups.com [mailto:gamsworld@googlegroups.com] On Behalf Of Sara Amr
Sent: Montag, 7. Dezember 2015 22:46
To: gamsworld
Subject: using power inside of sum



Hi,



I have two vectors of decision variables that i want to use in my objective function to calculate the Euclidean distance between them:



I write this: sqrt(sum(j, power(v1(j) - v2(j)),2))



And i get an error because the domain changes. I understood that when i am using the power function inside the sum it’s calculating a new value that is not over the domain j.



So is there a way to do this in GAMS in the same step, or over multiple steps?



Thanks,

Sara

–
To unsubscribe from this group and stop receiving emails from it, send an email to gamsworld+unsubscribe@googlegroups.com.
To post to this group, send email to gamsworld@googlegroups.com.
Visit this group at http://groups.google.com/group/gamsworld.
For more options, visit https://groups.google.com/d/optout.

–
To unsubscribe from this group and stop receiving emails from it, send an email to gamsworld+unsubscribe@googlegroups.com.
To post to this group, send email to gamsworld@googlegroups.com.
Visit this group at http://groups.google.com/group/gamsworld.
For more options, visit https://groups.google.com/d/optout.