Forget global exists; for virtually all cases, it's not the better solution. Instead, use the return values your function(s) calculate and pass the result of the first to the second.
NOTA BENE: Functions have their own name space; arguments in the function definition are "dummy" arguments that are known by name only within the context of the function; naming them as something in the calling workspace has no bearing whatever on what their values will be at run time; they're only associated with an actual value by the linkage from the calling statement.
a = 5;
b = 10;
c=name1(a, b);
d=name2(c, b)
NOTA BENE SECOND:
That the result of a function call can be used as the argument to another function -- the above is the same as
d=name2(name1(a,b), b)
function[x] = name1(a, b)
x = a + b;
end
function[y] = name2(a,b)
y = a + b;
end
