Function with variable number of input arguments

Question

Sid jayadev 2014-7-24

1
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https://ww2.mathworks.cn/matlabcentral/answers/143125-function-with-variable-number-of-input-arguments

评论： Sid jayadev 2014-7-24

Hey everyone,

I created a function called matrixmultiply, and I'm trying to define it for 2, 3, and 4 input arguments. How do I do this in one single script? I've heard "varargin" and "nargin" variables could work, but I don't know how to use those.

(I've defined it separately for 4 arguments already.)

Thanks!

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Answer 1

Azzi Abdelmalek 2014-7-24

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https://ww2.mathworks.cn/matlabcentral/answers/143125-function-with-variable-number-of-input-arguments#answer_146223

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In your case you can just use nargin to know the number of inputs. Look at this example

function y=fcn10(a,b,c,d)
if nargin==2
    y=a+b
elseif nargin==3
    y=a*b*c
elseif nargin==4
    y=(a+b)*(c+d)
end

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Sid jayadev 2014-7-24

ah ok great! thanks! I have a complete if..elseif..elseif...end loop for 4 arguments, so do i need to create separate if statements for 3 and 2 arguments, or can i simply continue nargin = 3 and margin in the original if statement for 4 variables?

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