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Why do I get a

Date: 2022-08-05 11:09:46

I am working on some simple object-oriented code in MATLAB. I am trying to call one of my class methods with no input or output arguments in its definition.

Function definition:

function roll_dice

Function call:

obj.roll_dice;

When this is executed, MATLAB says: 

 

??? Error using ==> roll_dice
Too many input arguments.

Error in ==> DiceSet>Diceset.Diceset at 11
obj.roll_dice;
(etc...)

Anyone have any ideas what could be causing it? Are there secret automatic arguments I'm unaware that I'm passing? 

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Expert Answer:

s: 

When you make the call: 

 

 obj.roll_dice;

It is actually equivalent to: 

 

roll_dice(obj);

So obj is the "secret" automatic argument being passed to roll_dice. If you rewrite the method roll_dice to accept a single input argument (even if you don't use it), things should work correctly.

Alternatively, if you know for sure that your method roll_dice is not going to perform any operations on the class object, you can declare it to be a static method as Dan suggests.

For more information on object-oriented programming in MATLAB, here's a link to the online documentation. 

 

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