Question

In Matlab:

Given the script:

x = 1;

x = fun(x-1);

y = x-1

and the function:

function y = fun(x)

x = x-1;

y = x-1;

end

What is the output

a) -2

b) -4

c) -3

d) -1

Answer 1

c) -3

Explanation:
-------------
function y = fun(x)
    x = x-1;
    y = x-1;
end

x = 1;
x = fun(x-1);   // calls fun with 1-1 = 0
    x = x-1; changes x to 0-1 = -1
    y = x-1; so, y = -1-1 = -2
    so, function returns -1
y = x-1, y = -2-1 = -3
so, value of y is -3.
since there is no semi-colon after y=x-1, value of y is printed.
so, -3 is printed