isdef - check variable existence

Calling Sequence

isdef(name [,where])

Parameters

• name : a character string
• where : an optional character string with default value 'all'

Description

isdef(name) returns %T if the variable 'var-name' exists and %F otherwise.

isdef(name,'local') returns %T if the variable 'var-name' exists in the local environment of the current function and %F otherwise.

Examples

A=1;
isdef('A')
clear A
isdef('A')
 

See Also

exists  whereis  type  typeof  clear