Hi there,

I'm trying some alteration to the DICE2013 model. I define a set of a hundred values and want to access one value for each period t. I.e. if t=5, I want GAMS to return the fifth value in the parameter cereq.

sets t Time periods (5 years per period) / 1*100 /

cereq list of multipliers /v1*v100/

I tried:

cereq(t)$ord((cereq)=t)

but that causes the program to crash.

How do I have to do this?

Many thanks

## Indexing a Set with multiple values

### Re: Indexing a Set with multiple values

You can compare the positions of the two elements in their respective sets by writing
or compare the position of cereq with the value of t:
Using .val is useful when comparing numerical sets that don't naturally start at 1, for example years.

Code: Select all

```
$(ord(cereq)=ord(t))
```

Code: Select all

```
$(ord(cereq)=t.val)
```