Hi Nilay,
If I understand it correctly, you want to ensure that the 'position' argument passed is a vector and thereby avoid implicit expansion.
For this use case, you can simply use a custom function (validatePositionArgument, in this case) to verify that the argument 'position' is a vector. If it's not, then the code throws an error. Here is the modified code:
classdef Car
properties
id
position
end
methods
function obj = Car(id, position)
validateattributes(id, {'numeric'}, {'scalar', 'positive', 'integer', 'nonempty'}); % validate 'id'
validatePositionArgument(position); % custom function to validate position
obj.id = id;
obj.position = position;
end
end
end
function validatePositionArgument(position)
% Throws an error if the input 'position' is not a vector or if it's
% length is not equal to 3.
if ~isvector(position) || length(position) ~= 3
error('Position must be a 1x3 vector.');
end
end
Instantiation of myCar with the 'position' argument as a vector:
>> myCar = Car(42, [10, 15, 20])
myCar =
Car with properties:
id: 42
position: [10 15 20]
If the 'position' argument is not a vector or if its size is not equal to 3:
>> myCar = Car(42, 20)
Error using Car>validatePositionArgument (line 21)
Position must be a 1x3 vector.
Error in Car (line 9)
validatePositionArgument(position); % custom function to validate position
For more information on the 'validateattributes' function, you can refer to the following documentation:
I hope this helps!
