Scripting Guide - SAS

Chapter 7 Data Structures 131
Lists
Lists
Lists are containers to store items, such as the following:
• numbers
• variables
• character strings
• expressions (for example, assignments (see “Assignments with Lists” on page 132) or function calls)
• matrices
• nested lists
Create a list in one of the following ways:
• use the List function
• use { } curly braces
Examples
Use the List() function or curly braces to create a list that includes numbers and variables:
x = List(1, 2, b);
x = {1, 2, b};
A list can contain text strings, other lists, and function calls:
{"Red", "Green", "Blue", {1, "true"}, sqrt(2)};
You can place a variable into a list and assign it a value at the same time:
Evaluate Lists
x = {a=1, b=2};
When you run a script that contains a list, a copy of the list is returned. The items inside the list are not
evaluated.
b = 7;
x = {1, 2, b, Sqrt(3)};
Show(x);
x = {1, 2, b, Sqrt(3)};
To evaluate items in a list, use the Eval List function.
b = 7;
x = {1, 2, b, Sqrt(3)};
c = Eval List(x);
{1, 2, 7, 1.73205080756888}