Matlab function return value

Question

I have one program that has function and the problem, return value, it has too many output.

Like exempley: y = text the answer comes up

Error in text (line 2)

if nargin == 0 

Output argument "array" (and maybe others) not assigned during call to "
C:\Users\name\Documents\MATLAB\text.m>text".

The program text.m reads a txt file that contains a couple of names and numbers like

exemple:

John doughlas 15986

Filip duch 357852

and so on. The program convert them to 15986 Doughlas John and so on.

function array = text(~) 
if nargin == 0 
dirr = '.';
end
answer = dir(dirr);  
k=1;
while k <= length(answer) 
    if answer(k).isdir 
        answer(k)=[]; 
    else
        filename{k}=answer(k).name;
        k=k+1;
    end
 end
chose=menu( 'choose file',filename);
namn = char(filename(chose));  
fid = fopen(namn, 'r');    
R = textscan(fid,'%s %s %s');  
x=-1;                                            
k=0;                                               
while x <= 24                                  
      x = k + 1;                                    
      All = [R{3}{x},'   ',R{1}{x},' ',R{2}{x}];
      disp(All)                                     
      k = k + 1;                                   
end                                                
fclose(fid);

Is there anyway to fix the problem without starting over from scratch?

Grateful for all the answers!

yuk · Accepted Answer · 2013-04-11 17:23:11Z

13

You specify the function output argument in the definition, but you don't assign anything to it in the function body.

For example, in

function y = student(j)

your output is y. So you have to assign something to y.

4 Comments

CSPTT Over a year ago

Thank you, I figure out where to put it but cant figure out the text.m, it has to many output.

yuk Over a year ago

You can return multiple outputs from a function with [x,y,z] = functionname(...). Or you can combine all outputs into a cell array or a structure. Read the documentation, it's clearly explained. And don't call the function text, since there is a build-in MATLAB function with this name.

CSPTT Over a year ago

Sorry but I cant find the result I am looking for maybe I am just to close to see it or I am blind. But I read the documentation and I got some results but not what I am looking for. Like exemple: y=25 y= numbers name1,2,3,4,5 and so on y= numbers name1 y = numbers name2 and so on.

yuk Over a year ago

Sorry, but I cannot understand what you need. Please explain in details what result do you expect. Better in a new question, since you've already accepted this one. You can refer to this question with a link.

Fthi.a.Abadi · Accepted Answer · 2017-05-12 15:42:11Z

2

Here is a working example.

The first part is to create a function called 'functionA' in a filename 'functionA.m'. Then put the following code inside:

    function  result = functionA(N,alpha)
    result = 5;
    return
    end

The second part is to create another Matlab file(i.e. upto you to name it) or you can use the Matlab command window even. Then run the following code:

    getresult = functionA(100,10);
    getresult

After running you get the following answer:

    ans = 
          5

answered May 12, 2017 at 15:42

Fthi.a.Abadi

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