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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