Help with conditional statement

GAMS
1

Hi,

Im pretty new to GAMS, and I was wondering how to define a conditional
statement that works as follows.
For example, for

Sets i /i1i4/
j /j1j4/;

I want to set a conditional statement in an equation that states that
the value of i is adjacent to j,
or [ord(i) EQ ord(j) +1 and ord(i) EQ ord(j) -1], and any other values
of i would not be considered. May I know how i can go about doing
this?

Thank you very much for your time!

\

2

Hi,

I think you have to do it in this way:

Equation(i,j) $((ord(i) EQ (ord(j) +1)) OR (ord(i) EQ (ord(j) -1)))

You have to use OR instead of AND.
I hope this help

Good Luck!
Luis C

On 10 nov, 00:39, “wei_3...@hotmail.com” wrote:

Hi,

Im pretty new to GAMS, and I was wondering how to define a conditional
statement that works as follows.
For example, for

Sets i /i1i4/
j /j1j4/;

I want to set a conditional statement in an equation that states that
the value of i is adjacent to j,
or [ord(i) EQ ord(j) +1 and ord(i) EQ ord(j) -1], and any other values
of i would not be considered. May I know how i can go about doing
this?

Thank you very much for your time!

\