Matlab: plot against wavelength instead of frequency

Question

I have an array of points that I've associated against frequency. How do I plot that array against wavelength instead of frequency? Keep in mind that I don't want to define functions, just working with arrays here. Here's how I would plot the array known as Q:

f = 100:500;  % frequency points
Q = f^2;      % a "function" of frequency
plot(f,Q)

Now I know I can simply define a new array lambda=c/f where c=speed of light, but can I replot Q against wavelength without having to redefine Q as a function of wavelength?

Answer 1

Sure, just change the x-axis:

plot(c./f, Q);