undef

undef(obj, [objType=VAR])

or

undef all

obj is a string or a string vector indicating the names of objects to be undefined. To undefine all the variables in a category, use the unquoted "all" for obj.

objType (optional) is type of objects to be undefined. The types can be: VAR (variable), SHARED (shared variable) or DEF (function definition). The default value is VAR.

To delete all user-defined objects in the system except shared variables, use "undef all".

Release variables or function definitions from the memory. You can also release a local variable (VAR) from the memory using "= NULL".

undef all;
x=1
undef(`x);
x=1
y=2
undef(`x`y);
share table(1..3 as x, 4..6 as y) as t
undef(`t, SHARED);

def f(a){return a+1}
undef(`f, DEF);
a=1
b=2
undef all, VAR;