Calling functions

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Richard
Richard 2012-1-19
I have written a MATLAB code say myfun.m which first line is
function y = myfun(x)
Now I want to call it in another code I am writing. I have 2 values x1 and x2 and I want my present code to compare myfun(x1) and myfun(x2) such that if myfun(x1) > myfun(x2) then it does something.
I tried writing
if (myfun(x1)>myfun(x2))
...
But MATLAB says
??? Output argument "y" (and maybe others) not assigned during
call to "/Users/user/Documents/MATLAB/compare.m>myfun".
What should I do?
Thanks.

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回答（2 个）

the cyclist
the cyclist 2012-1-19
This works for me:
x1 = 2;
x2 = 1;
if myfun(x1) > myfun(x2)
disp('myfun(x1) is greater than myfun(x2)')
else
disp('myfun(x1) is not greater than myfun(x2)')
end
where myfun.m is:
function y = myfun(x)
y = x.^2;
end
Jan
Jan 2012-1-19
The error message means, that for some branchs of the program myfun the output y is not defined. You can use the debugger to let Martlab stop, when the problem occurs:
dbstop if error
Then you can investigate the current calling stack and values of the variables.

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