FreeMat
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Section: Inspection Functions
Tests for the existence and non-emptiness of a variable. the general syntax for its use is
y = isset('name')
where name
is the name of the variable to test. This is functionally equivalent to
y = exist('name','var') & ~isempty(name)
It returns a logical
1 if the variable is defined in the current workspace, and is not empty, and returns a 0 otherwise.
Some simple examples of using isset
--> who Variable Name Type Flags Size --> isset('a') ans = 0 --> a = []; --> isset('a') ans = 0 --> a = 2; --> isset('a') ans = 1