function f = myode(t,y)

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% function f = myode(t,y)
%
% This function is used to evaluate f(t,y)=y'(t) for the differential 
% equation of Problem 4, using the rates in global variable myrate.
%
% Dianne O'Leary 05/2006
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

global myrate

k = length(t);

for i=1:k,
   f(i) = myrate(floor(t(i))+1)*y;
end