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