Optional args in MATLAB functions

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How can I declare function in MATLAB with optional arguments?

For example: function [a] = train(x, y, opt), where opt must be an optional argument.

math parameters matlab arguments function
4 Answers

Mathworks:Function Argument Validation

There is a detailed description about how to user optional parameters in function. Also, you can learn how to use function like build-in matlab fun like

fun(arg1,'key1',value1)

There is some example using the trick from above:

function [a] = train(x,y,opt)
    arguments
        x double
        y double
        opt {mustBeNonempty} = true
        % this set the default value for opt is true
    end
    
    if opt
        a = 1;
    else
        a = x+y;
    end
end
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