very simple one - return variables

[suigeneris]

Hi,
I just started programming MatLab, so I still have basic problems.

I have 3 M-Files. One script which operates the two other function m-files and the two function m-files which seperate functions. In the first m- file I get a variable X in the end. But I don't save the variable. In the second m-file which I access after the first one I need X. I though I can just address X but then I get an error.

How can the second function adress the variable X without saving it.

greets

sui

 

[MikeyP]

if function 1 is defined as

function x = SomeFunction1(a,b,c,d)
   
  x = a+b+c+d

and function 2 is defined as

function y = SomeFunction2(e,f,g,p)
   
  y = e*f*g*p

Then the code in the main script would be

TotalFood = SomeFunction1(Apples,Bananas,Carrots,Dessert)

TotalCalories = SomeFunction2(Meals,Days,People,TotalFood)

The only variable in the first function which is avaiable to the main program is "y" which has been given the name "TotalFood" in the main program. If you want to pass more than one variable back from a function into the main workspace then you have to specify it in the function definition eg

function [x,y,z] = SomeFunction3(a,b,c)
   x = b+c;
   y = a*b;
   z = c/a;

and in the main program

[p,q,r] = SomeFunction3(NumberOfMice,NumberOfCats,NumberOfDogs);

The variables in the function SomeFunction3 with the lables x, y and z are now available in the main workspace with the lables p, q and r.

If you have a particular variable (or more usually a constant) which you want to be available to all functions you can use the "global" command. Type "help global" for more info.

M

 

[suigeneris]

Thank you very much. That helped a lot.

Greetings

sui