How to count the frequency of repeated values in an array of values with the index position?

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John Doe
John Doe 2019-9-28
回答： the cyclist 2019-9-28
clc
clear
t=0:.001:10;
y=sin(2*pi*t);
I want to count the frequency of repeated values in 'y' . How can I do that? I also want to print out the index position where value is being repeated.
Thanks!

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the cyclist
the cyclist 2019-9-28
You can do both of these things using the unique command.
Be aware, though, that due to accuracy of floating point numbers, you may not get exact repeated values when you expect them.

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