time my code in matlab

To time the execution of a block of code in MATLAB, follow these steps:

1. Use the "tic" command to mark the beginning of the block of code to be timed.
2. Execute the code to be timed.
3. Use the "toc" command to mark the end of the block of code to be timed.
4. Subtract the starting time obtained from tic from the ending time obtained from toc to get the execution time.

Here's an example:

main.m
% Start timing the code
tic

% Block of code to be timed
a = rand(1000);
b = a*a;

% End timing the code
toc

% Calculate and display the execution time
execution_time = toc - tic;
fprintf('Execution time: %f seconds\n', execution_time);
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This will output the execution time in seconds for the block of code between the "tic" and "toc" commands.