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FreeMat
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Section: Inspection Functions
Tests the type of a variable. The syntax for its use is
y = isa(x,type)
where x is the variable to test, and type is the type. Supported built-in types are
'cell' for cell-arrays 'struct' for structure-arrays 'logical' for logical arrays 'uint8' for unsigned 8-bit integers 'int8' for signed 8-bit integers 'uint16' for unsigned 16-bit integers 'int16' for signed 16-bit integers 'uint32' for unsigned 32-bit integers 'int32' for signed 32-bit integers 'uint64' for unsigned 64-bit integers 'int64' for signed 64-bit integers 'single' for 32-bit floating point numbers 'double' for 64-bit floating point numbers 'char' for string arrays If the argument is a user-defined type (via the class function), then the name of that class is returned.
Here are some examples of the isa call.
--> a = {1}
a =
[1]
--> isa(a,'char')
ans =
0
--> isa(a,'cell')
ans =
1
Here we use isa along with shortcut boolean evaluation to safely determine if a variable contains the string 'hello'
--> a = 'hello' a = hello --> isa(a,'char') && strcmp(a,'hello') ans = 1