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Stop the internal timer

Usages

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• It stops the internal timer, and reports the elapsed time (in seconds) since the last call of tic.
• It shows a message in the Console to report the elapsed time.

dt = toc

• It stops the internal timer, and returns the elapsed time (in seconds) since the last call of tic.

toc(t)

• The input t should have been obtained previously by calling t = tic. Otherwise, the time reported will be incorrect.
• It reports the elapsed time (in seconds) between t and the time when toc(t) is called.
• It shows a message in the Console to report the elapsed time.

dt = toc(t)

• The input t should have been obtained previously by calling t = tic. Otherwise, the time reported will be incorrect.
• It returns the elapsed time (in seconds) between t and the time when toc(t) is called.

Examples

• The following code was run on an iPad Pro 11-inch (2nd generation). The elapsed times reported were measured from the same starting time when tic is called.

Input

tic
% Each of the matrices has 1,000,000 entries.
a = rand(1000,1000);
b = rand(1000,1000);
% Time taken to create the matrices.
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C = a'.*b';
% Time taken to create the matrices and to perform the multiplication.
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Output

Time elapsed: 3.077404e-02 seconds.

Time elapsed: 8.709546e-01 seconds.

• Time (in seconds) required to solve a system of n equations on an iPad Pro 11-inch (2nd generation).

Input

clear
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)
xlabel('n');
ylabel('Time needed');
title('Time required to solve a system of n linear equations')

Output