Not performing an if statement if a certain value is selected

I am writing a function which calculates an average value, for the values 1-4, which the user selects earlier, the code can continue fine, however if the user selects five, I do not want the code to be carried out. I have tried return but that does not work.

Here is the function:

function [avg] = avg_wins(team) 

if team == 1
    avg = readtable('Arsenal.xlsx');
elseif team == 2 
        avg = readtable('Liverpool.xlsx');
    elseif team ==3 
            avg = readtable('ManchesterUnited.xlsx');
elseif team == 4 
               avg = readtable('Chelsea.xlsx');
elseif team == 5
 return

end
x = sum(avg{:,2})/12;
fprintf('Average wins per season = %d\n',round(x))
end

Thanks for any help

Answer 1

[Walter Roberson]

The difficulty you are having is that when you return from a function (whether through return statement or by reaching the end of the flow), you need to have assigned values to any output variables that the user's code expects to be present. You cannot just return from avg_wins upon team 5 because the context needs avg to have been given a value. Some value. Any value.

If you do not wish to return a value, then you have to cause MATLAB to create an error condition using error() or throw() (or rethrow() ) . The caller's code will see the error condition and react to it, typically by giving an error message and stopping execution, but code can use try/catch to manage errors if it wants to.

[Jake keogh]

Thanks Walter,

Is there anyway of assigning a value to 5 which will stop it completing the last part of code? or shall I rewrite it

Thanks

[Walter Roberson]

function [avg] = avg_wins(team) 
    if team == 1
        avg = readtable('Arsenal.xlsx');
    elseif team == 2 
        avg = readtable('Liverpool.xlsx');
    elseif team ==3 
        avg = readtable('ManchesterUnited.xlsx');
    elseif team == 4 
        avg = readtable('Chelsea.xlsx');
    else
        avg = table([]);
        fprintf('Wrong team, must be 1, 2, 3, or 4\n');
        return
    end
    x = sum(avg{:,2})/12;
    fprintf('Average wins per season = %d\n',round(x))
end

But are you sure you want to return the entire set of data about the team, but not return the number of average wins that you carefully calculated and put into x ?

[Jake keogh]

Thanks Walter,

does exactly what I need it to.