Troubleshooting Variables and Column Names

When you reference a column name using As Name(), and Names Default To Here( 1 ) is set, JMP returns a variable reference. That reference is then processed using the standard reference rules.

In the following example, there is no height variable in the Here: scope, so JMP returns an error.

Names Default To Here( 1 );

Open( "$SAMPLE_DATA/Big Class.jmp" );

As Name( "height" )[3]; // converts height to a variable reference

As Name( "height" )[/*###*/3];

To prevent this problem, use one of the following methods:

•

Use As Column() instead of As Name():

Names Default To Here( 1 );

Open( "$SAMPLE_DATA/Big Class.jmp" );

As Column( "height" )[3]; // converts height to a data column reference

•

Explicitly scope height with As Name():

Names Default To Here( 1 );

dt = Open( "$SAMPLE_DATA/Big Class.jmp" );

dt:( As Name( "height" ) )[3]; // scopes height as a data column reference

These scripts return 55, the value of height in the third row of Big Class.jmp.