Plot two curve of different program in same graphs

I have improved the program, I want to compare the difference after the improvement. Can I combine the curve on this two program in same graphs?

Answer 1

[KALYAN ACHARJYA]

Call two programs as function, see the following example

Code 1:

function code1(x)
y=exp(x);
plot(y);
hold on;
end

Code 2:

function code2(x)
y=log(x);
plot(y);
end

Main Script:

x=0:0.01:10;
code1(x);
code2(x);

[Chun Yin Lui]

Thank you for your help