Declare a variable that will contain a list of values of a given type.

Arguments:

type name

The type of list and the name to give it.

value

One of the values to include in the initial contents of the list.

Note that if you already have a list of the same type, you can assign this directly to the new list variable.

Example:

The following example creates a list of sources and observes each of them in turn for 1 minute.

 listof Source sl = {3c345, 3c273, 0552+398}
 foreach(Source s) $sl {
   track $s
   until $elapsed >= 1m
 }

Context:

Lists are primarily intended for use with foreach loops. They allow one to iterate a set of commands over a given selection of values. The above example is limited, because only one thing is being listed, but with lists of group datatypes one can extend this to lists of many items.