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Posted 12-02-2016 01:25 PM
(1368 views)

Is there any way we can change length of the variable created with CREATE DATA statement? I have a text variable which is used as a key variable in PROC OPTMODEL but it gets truncated in the data which is created with CREATE DATA statement. I am new to PROC OPTMODEL. Could you also please give a example of how OR condition is used in constraint? For example, sum {c in customers} (product[c] IN ('A', 'B'))

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The CREATE DATA statement has a LENGTH= option:

Correct syntax for your sum is:

`sum {c in customers: product[c] IN {'A', 'B'}}`

For new users of PROC OPTMODEL, I recommend this book of examples.

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The CREATE DATA statement has a LENGTH= option:

Correct syntax for your sum is:

`sum {c in customers: product[c] IN {'A', 'B'}}`

For new users of PROC OPTMODEL, I recommend this book of examples.

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Is sum {c in customers: product[c] IN {'A', 'B'}} equivalent to sum {c in customers} (product[c] IN {'A', 'B'})? I get confused with '**:'** symbol. Does it represent AND condition? Many times i see ':' is not required to apply AND condition.

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The colon : operator (which you can think of as "such that") allows you to select a subset based on a logical expression:

The following expressions are all equivalent and count the number of customers whose product is A or B:

```
sum {c in customers} (product[c] IN {'A', 'B'})
sum {c in customers} (if product[c] IN {'A', 'B'} then 1 else 0)
sum {c in customers} (if product[c] IN {'A', 'B'} then 1)
sum {c in customers: product[c] IN {'A', 'B'}} 1
card({c in customers: product[c] IN {'A', 'B'})
```

See also my reply here, which is similar:

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Thanks @RobPratt. You have been very helpful. I've made a good progress in learning PROC OPTMODEL and credit goes to you for providing links and clarifying doubts with examples.

Last question - Why do we need to write 1 in the following statement?

```
sum {c in customers: product[c] IN {'A', 'B'}} 1
```

Can't we simple write (without 1) -

```
sum {c in customers: product[c] IN {'A', 'B'}}
```

I remember you provided the similar solution wherein you mentioned 1 before dividing by 3-

```
ceil(sum {c in customers: sales[c] > 50} 1 / 3)
```

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Glad to help. The 1 is there because the SUM operator requires a summand.

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