Don't understand my error mention

I get the folowing error mention:

Error in ==> trapezes at 3
if(n<1)

??? Output argument "Itr" (and maybe others) not assigned during
call to "C:\Users\Lerak\Documents\MATLAB\trapezes.m>trapezes".

Error in ==> principal_1 at 45
                     poidstra=trapezes(o);

Could somebody explain me what this really means?

Answer 1

[Kevin Claytor]

Can you post the code to trapezes - the error message says the problem is in there, you have something like;

function Itr=trapezes(n)
  if n<1
    Itr = 5;
  end
end

The problem here is that if n > 1, there is no case that assigns Itr, so there is no output variable. You could use;

function Itr=trapezes(n)
  Itr=0;
  if n<1
    Itr = 5;
  else
    Itr = 1;
  end
end

Now you have a success case, a fail case, and a default case that you can check against.