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Start stopwatch timer
tic
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.
timerVal |
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