NAMELIST

The NAMELIST @ statement defines a list of variables or array names, and associates it with a unique group name.

NAMELIST / grname / namelist [[,] / grname / namelist ] ...

Description

The NAMELIST statement contains a group name and other items.

Group Name

The group name is used in the namelist-directed I/O statement to identify the list of variables or arrays that are to be read or written. This name is used by namelist-directed I/O statements instead of an input/output list. The group name must be unique, and identifies a list whose items can be read or written.

A group of variables can be defined through several NAMELIST statements with the same group name. Together, these definitions are taken as defining one NAMELIST group.

Namelist Items

The namelist items can be of any data type. The items in the namelist can be variables or arrays, and can appear in more than one namelist. Only the items specified in the namelist can be read or written in namelist-directed I/O, but it is not necessary to specify data in the input record for every item of the namelist.

The order of the items in the namelist controls the order in which the values are written in namelist-directed output. The items in the input record can be in any order.

Restrictions

Input data can assign values to the elements of arrays or to substrings of strings that appear in a namelist.

The following constructs cannot appear in a NAMELIST statement:

• Constants (parameters)

• Array elements

• Records and record fields

• Character substrings

• Dummy assumed-size arrays

Example

Example: The NAMELIST statement:

       CHARACTER*16 SAMPLE 
       LOGICAL*4 NEW 
       REAL*4 DELTA 
       NAMELIST /CASE/ SAMPLE, NEW, DELTA 

In this example, the group CASE has three variables: SAMPLE, NEW, and DELTA.