Here I am facing a problem in output for all solution its showing the same unrecognized variable or name. Not able to proceed further

[Torsten]

If you call a function, you must give values to its inputs - in this case "name" and "age" in your call

find_max_age(name,age)

[Stephen23]

"its showing the same unrecognized variable or name"

You will get this error when you call a function like this:

find_max_age(name,age)

What value should AGE have: 3? 10? 99? How should MATLAB know what value it should use if you do not tell it the value?

[Shreya]

I have tired but I am not understanding again I am getting error

[Stephen23]

"I have tired but I am not understanding again I am getting error"

No, you changed the function definition to something invalid. Change it back to what it was.

I wrote that you need to tell MATLAB the values when you call the function. Lets try a simple example.

Here I call the sine function with an input value of pi/5:

x = pi/5;
sin(x)

ans = 0.5878

Note how x is defined before I call the function SIN.

Now lets try what you are doing (i.e. calling a function with an undefined variable):

sin(y)

Unrecognized function or variable 'y'.

What value does y have? Where is it defined? Answer: nowhere. Result: error.

Answer 1

[Voss]

Your function defintion was fine originally.

function old_name = find_max_age(name,age)
     [~,Id]=max(age)
     old_name=name(Id)
end

The problem was that in your Scratch Pad, you did not define any values for the variables name or age before attempting to pass those variables to the find_max_age function.

You have to have something to call the function with, right? For example:

% define some variables:
name = ["Baba","Booey"];
age = [2 9];

% call the function with those variables as inputs:
find_max_age(name,age)

Note that the variables in the Scratch Pad script can have any (valid) name; they don't have to be name and age, i.e., they don't have to match the names of the variables defined in the find_max_age function. For example, this works just as well, without modifying the find_max_age function definition:

% define some variables:
some_names = ["Baba","Booey"];
and_some_ages_too = [2 9];

% call the function with those variables as inputs:
find_max_age(some_names,and_some_ages_too)