Return true if var is an object from the class str.
str - a string: classname expected
📤 Output argument
res - a logical: true or false
isa returns a logical 1 if the argument is a cell array and a logical 0 otherwise.
str can also be 'numeric', 'float', or 'integer':
numeric: floating point or integer array: double, single, int8, uint8, int16, uint16, int32, uint32, int64, uint64
float: single or double precision floating-point array: double, single
integer: unsigned or signed integer array: int8, uint8, int16, uint16, int32, uint32, int64, uint64
If var is a handle object, str can be 'handle' or type name of the handle.
class, isinteger, isnumeric.
