multiple function outputs

Question

David Craig 2011-8-20

2
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https://ww2.mathworks.cn/matlabcentral/answers/14116-multiple-function-outputs

评论： Adithya Papa 2020-2-2

hi i am working through an online tutorial and having trouble with the following function,

function [summ,prodd] = sumprod(x1,x2)
% usage:
% [summ, prodd] = sumprod(x1,x2)
% x1 = a complex number
% x2 = another complex number
% summ = sum of x1 and x2
% prodd = product pf x1 and x2
prodd = (x1)*(x2);
summ = x1 + x2;

I want it to output the two variables but it only gives me the sum. thanks,

David

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Abinash Mandal 2019-6-14

Suppose we only want second output (product in this case), then how to do that??

Stephen23 2019-6-15

编辑：Stephen23 2019-6-15

@Abinash Mandal: by reading this comment below, from three years ago, and the comment that follows it:

https://www.mathworks.com/matlabcentral/answers/14116-multiple-function-outputs#comment_389822

Or by using your favorite internet search engine to search for "MATLAB ignore function outputs" and reading the first link that is returned:

https://www.mathworks.com/help/matlab/matlab_prog/ignore-function-outputs.html

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Answer 1

Fangjun Jiang 2011-8-20

9
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https://ww2.mathworks.cn/matlabcentral/answers/14116-multiple-function-outputs#answer_19330

call it this way: [s,p]=sumprod(x1,x2)

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Kannapiran Arasu 2016-9-8

For this I always gt the first value namely s. If I want only p how to go about it?

Fangjun Jiang 2016-9-8

You can do this. [~,p]=sumprod(x1,x2). Please note that earlier version of MATLAB does not support this "~" syntax.

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Answer 2

amatlabr 2018-3-22

0
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https://ww2.mathworks.cn/matlabcentral/answers/14116-multiple-function-outputs#answer_311323

编辑：amatlabr 2018-3-22

在 MATLAB Online 中打开

I know is an answered question, but I wrote two simple functions in different m-file under same folder :

function [ somma,prodotto ] = sommaprodotto( a,b )
somma = a +b;
prodotto = a*b;
end

and a main() calling the above function :

function   [s,p]=main( )
val1 = 39;
val2 = 21;
[s,p]= sommaprodotto(val1,val2);
end

I click on run button but I only get the first value, why? I also noticed if I write calling function without semicolon ( [s,p]= sommaprodotto(val1,val2) ) I get both values in the command window, but not in the working space, why? Thanks

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Stephen23 2018-3-22

编辑：Stephen23 2018-3-22

在 MATLAB Online 中打开

"I click on run command but I only get the first value"

Because you click on the "Run" button. Do NOT use that button. That button is the worst design decision in the history of MATLAB, because no beginner knows what it really does. Ignore that button.

To run any code simply type it in the command window (or another script/function/...) together with any required input and output arguments and then press enter. For example:

>> [S_out,P_out] = main()

and then press enter. You will get both outputs.

"I also noticed if I write calling function without semicolon ... I get both values in the command window, but not in the working space"

Which workspace? Where are you calling this function? How are you checking if the variables are in that workspace? Try writing whos straight after when you call that function: are those variables listed?

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