% hints/ideas for 3.9.17 c plot:
F = 2; % best to set up variables as in problem
% let's say your D(w) func was D = sqrt(1 + w^2)
D = @(w) sqrt(1 + w.^2); % Note need .^ symbol (rather than ^) here to take
% power of each element of w separately!
w = 0:0.01:5; % Set up array of w values to compute
R = F./D(w); % Again, note the ./ since want to divide by each
% element of vector D(w) separately
plot(w, R); xlabel('\omega'); ylabel('R'); % nice greek symbol in label