% This file is a function M-file.
% Function M-files are used to define functions.
% The file name is the same as the function name.
% Function files may call global variables defined elsewhere.
% The first command line in a function M-file starts with "function".

function Dq = ode(t,q);

% The values of R and C are assigned in example3.m
global R C

Dq = -1/(R*C)*q;

return

% Note that Dq stands for dq/dt in the ODE for RC circuit example.
% See file example3.m now.