Sorry, forgot to put in the title I am using MATLAB.

I'm pretty sure I understand how to code this, the way the instructions are worded for it are confusing me. Here's a screenshot of them: http://i.imgur.com/Y6Rw8y6.png

So I understand I would simply make two vectors for the ranges of sigma and omega.

sig = -8:0.1:0;
omeg = -10:0.1:10;

Then the meshgrid

[X,Y] = meshgrid(sig, omeg);

Not quite sure how to create a vector for parts of the complex variable, a grid for s, or how to determine the magnitude of the function since it asks you to plot the real and imaginary components. I understand the real is sigma and the imaginary is omega, but then why does it add I may need to use the real and imag commands? The only surface plots I've done have been simple where you're given a range of two variables, you simply create the meshgrid, then evaluate the function using the meshgrid and save that as z, then plot it with the surf command. Also how come ^wn = 5 but then I'm given a range separately as well?

This is what I have right now, I feel like I'm completely missing a large part of this problem:

sigma = -8:0.1:0;
omega = -10:0.1:10;

[x,y] = meshgrid(sigma, omega);

s = x   y;

z = (5^2)./(s.^2   2*0.4*5.*s   5^2);

surf(x,y,z);