%% Timing functions
%
% To measure the time required to run a function, use the timeit function. 
% The timeit function calls the specified function multiple times, 
% and returns the median of the measurements, in seconds. 
x = 1.0
f = @() sin(exp(sqrt(x)));
etime = timeit(f)


%% Timing portions of code
%
% To estimate how long a portion of your program takes to run, use the 
% stopwatch timer functions, tic() and toc(). Invoking tic() starts the 
% timer, and the next toc() reads the elapsed time.

tic()
np = 100000;
y = zeros(np, 1);
for i = 1:np
    y(i) = sin(exp(sqrt(i)));
end
etime = toc()

%% Sometimes programs run too fast for tic() and toc() to provide useful data. 
% If your code is faster than 1/10 second, consider measuring it running in a loop, 
% and then average to find the time for a single run.
tic()
nrep = 10;
for j = 1:nrep
    np = 100000;
    y = zeros(np, 1);
    for i = 1:np
        y(i) = sin(exp(sqrt(i)));
    end
end
etime = toc()/nrep