multiple function outputs

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

[sompo justice]

How do you call the function from you command window? I suggest you write some thing like: [summ,Product] = sumprod(10,35) for example 10 and 35 being your 2 complex numbers.

[Jan]

@sompo: exactly.

[Abinash Mandal]

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

[Stephen23]

@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

Answer 1

[Fangjun Jiang]

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

[Kannapiran Arasu]

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

[Fangjun Jiang]

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

Answer 2

[amatlabr]

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

[Stephen23]

"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?

Answer 3

[Adithya Papa]

function [summ,prodd] = sumprod(x1,x2)

prodd = (x1)*(x2)

summ = x1 + x2;

[Adithya Papa]

Now it will give 2 outputs.The semicolon after the prodd suppresses the output.That's why it is not showing