Difference between revisions of "CoCoA:IsDefined"
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Latest revision as of 10:02, 24 October 2007
IsDefined
check if an expression has been defined
Description
This function returns TRUE if E is defined, otherwise it returns
false. Typically, it is used to check if a name has already been
assigned.
NOTE: this function used to be named Defined.
Example
IsDefined(MyVariable); FALSE ------------------------------- MyVariable := 3; IsDefined(MyVariable); TRUE -------------------------------
Syntax
IsDefined(E) where E is a CoCoA expression.
<type>memory</type> <type>boolean</type>