Calling a function without an Output argument

Question

Telema Harry 2021-4-5

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/793017-calling-a-function-without-an-output-argument

评论： Adam Danz 2021-4-6

采纳的回答： Adam Danz

在 MATLAB Online 中打开

Hi Programmers,

I have a function that plots the phase and magnitude of my signal.

I want this function to plot only the magnitude if no ouput argument is provided when the function is called.

Y = Myplot (a,b)
Y = figure(1)
subplot(2,1,1)
stem (a)
subplot(2,1,2)
stem (b)
% I want to plot only stem (a) when the function is called without the
% output argument.
Myplot (a,b)
stem (a)

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Answer 1

Adam Danz 2021-4-5

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/793017-calling-a-function-without-an-output-argument#answer_667412

编辑：Adam Danz 2021-4-5

在 MATLAB Online 中打开

Use nargout to determine the number of output arguments.

if nargout==0
    % do something
elseif nargout < 2
    % do something else
end

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Telema Harry 2021-4-5

I modified the code slightly and it gave me the intended result.

if nargout==0

% do something

elseif nargout > 0

% do something else

end

Thank you for your help.

Adam Danz 2021-4-6

在 MATLAB Online 中打开

This can be simplified to

if nargout == 0
else
end

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Answer 2

David Hill 2021-4-5

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/793017-calling-a-function-without-an-output-argument#answer_667397

在 MATLAB Online 中打开

Change the number of input arguments instead

function y=Myplot(varagin)
y=figure;  
  if nargin==2
      subplot(2,1,1);
      stem(varagin{1});
      subplot(2,1,2);
      stem(varagin{2});
  else
      stem(varagin{1});
end