Return control form a function to the main program

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Dhaval
Dhaval 2011-6-13
So I have a function (say xyz.m) with inputs and outputs (integers and strings). I specify an 'if' condition, and if it not satisfied, then I want my program to discontinue executing any more lines from the function (xyz.m) and return the control to the very next line of my main program (let us call the main function as main.m). I tried using the syntax 'return' but it gives me an error because the variables that were supposed to be returned/filled by the function are not assigned (like this: ??? Output argument variable (and maybe others) not assigned during call <function.). So is there any other sytanx or command that does the job (something as simple as 'break' which simply quits the 'for' or 'while' loop). Thanks in advance.

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采纳的回答

Matt Fig
Matt Fig 2011-6-13
Define default output variables before the return statement.
function x = myx(A)
if A/2 > 7
x = [];
return
else
x = A+3;
end
  1 个评论
Dhaval
Dhaval 2011-6-15
Thank you very much, your solution is simple and works very well! But for some reason the value of x (since it is a null set) is displayed even though I've put semi-colon at the end of it.

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更多回答（1 个）

Fangjun Jiang
Fangjun Jiang 2011-6-13
Even if such command or function exists, you still have the problem that the return variables of your xyz.m have not been set yet. xyz.m may have multiple return variables such [x, y,z]=function xyz. A good practice is to initialize or set the default value for x, y and z at the begining of your xyz.m so you won't have that problem.
  1 个评论
Dhaval
Dhaval 2011-6-15
Yes, I understand. I was hoping for a command that would set the return variables as null sets by default. But thanks for the advice, I'll set the default value for the return variables in the beginning of the program.

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