Start stopwatch timer
timerVal = tic
tic starts a stopwatch timer to measure performance. The function records the internal time at execution of the tic command. Display the elapsed time with the toc function.
timerVal = tic returns the value of the internal timer at the execution of the tic command, so that you can record time for simultaneous time spans.
Value of the internal timer at the execution of the tic command. This value is used as an input argument for a subsequent call to toc. You should not rely on the meaning of this value.
Measure time to generate two random matrices and compute element-by-element multiplication of their transposes.
tic A = rand(12000, 4400); B = rand(12000, 4400); toc C = A'.*B'; toc
Measure how the time required to solve a linear system varies with the order of a matrix:
t = zeros(1,100); for n = 1:100 A = rand(n,n); b = rand(n,1); tic; x = A\b; t(n) = toc; end plot(t)
Measure multiple time spans simultaneously using two pairs of tic/toc calls. To do this, measure the minimum and average time to compute a summation of Bessel functions:
REPS = 1000; minTime = Inf; nsum = 10; tic; % TIC, pair 1 for i=1:REPS tStart = tic; % TIC, pair 2 total = 0; for j=1:nsum total = total + besselj(j,REPS); end tElapsed = toc(tStart); % TOC, pair 2 minTime = min(tElapsed, minTime); end averageTime = toc/REPS; % TOC, pair 1