How to refer to parameter from function in the loop.

I've got such problem. Whole code is compiling at my teachers computer, whereas on mine it says that: Undefined function or method 'y' for input arguments of type 'double' [Just the part of the code to which it refers]:

 for i=round(length(t)/2):length(t)-1
        if y(i,1)<-20  &&  y(i+1,1)>-20
            t20=[t20,t(i)];
 end

y is used in my func.m file. And now is the question: how to refer to it in my loop? I got no idea why it works there and not on my Matlab.

[Muhammad Usman Saleem]

After looking on your question i can batter guide you....please share complete question

[Muhammad Usman Saleem]

to me this statement if y(i,1)<-20 && y(i+1,1)>-20 % is used as check means when (i,1)<-20 AND y(i+1,1)>-2 then do with t20???

Answer 1

[Salaheddin Hosseinzadeh]

Dear Michael,

You used y in your myfunc.m function, so it is not recognized in another function if you don't return as an output.

function y = myfunction(a,b,c)
 % so this is your y function
 % somewhere at the end of your function you have to assign y
 % for example
 y = a + b;
end

So later in another code, when you're using myfunction you get y back

% this is not myfunction (it's yourFunction) lol
function yourFunction(e,f,g)
   % somewhere in this function you're calling myfunction
   y = myfunction(a,b,c)
  for i=round(length(t)/2):length(t)-1
      if y(i,1)<-20  &&  y(i+1,1)>-20
          t20=[t20,t(i)];
 end

As I understood this is your problem, if I'm wrong please explain more ;)

[Michael]

Yep. That's what I needed to have explained. Basics but sometimes (I code once, or twice a semester for projects) I need that guidance.