function with variable amount of inputs

Question

Romano Geerling 2016-4-11

0
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https://ww2.mathworks.cn/matlabcentral/answers/278375-function-with-variable-amount-of-inputs

编辑： Stephen23 2016-4-11

Hello everybody,

maybe this is very simple question for you guys, but I'm trying to write a function in matlab that works when having just 2 inputs or more. I have been looking for a solution, but couldn't find exactly what I wanted. It is like this

function myfunction(x1,y1,x2,y2)
plot(x1,y1) %user just puts x1,y1
or
plot(x1,y1,x2,y2) %user puts x1,y1,x2,y2
end

I want the function to work, when the user just puts x1,y1 as input, but I also want it to work when the user puts x1,y1,x2,y2 and plot a figure.

Many thanks in advance.

Romano

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Answer 1

Stephen23 2016-4-11

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/278375-function-with-variable-amount-of-inputs#answer_217391

编辑：Stephen23 2016-4-11

在 MATLAB Online 中打开

Use nargin:

function myfun(x1,y1,x2,y2)
switch nargin
    case 2
        plot(x1,y1)
    case 4
        plot(x1,y1,x2,y2)
    otherwise
        error('This number of arguments is not supported')
end
end

Or for the general case you can use varargin: this has the disadvantage that the inputs are not named, so tab completion and the code helper tools will only show varargin instead of more useful variable names.