Count distinct array values

Hi :)

I've searched in forums and faq for this but can't find anything useful.
It's a quick one, I'm pretty sure there's an easy way for doing this (one function most likely);

I have an array (for example):
keys[1, 12, 13, 14, 15, 17, 33, 34, 35, 8, 16, 28, 1, 14, 28, 36]

Now I would like to count how many times each array value is in the array. In this case I need to display only the keys that occur twice in the array (so: 1 and 14).

Is there an easy way for doing this? Thanks very much in advance.

René

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one function most likely

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A function can be as complex as an OS.

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Originally Posted by siavoshkc

A function can be as complex as an OS.

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I meant a standard function that's already defined in some header file. Something like countdistinct(1, keys) (count the amount of times '1' is in the array 'keys')

I am not sure if such function exists. But you can simply do it yourself if it doesn't.

First sort the array (There is a standard function to do it), and then count distinct enteries.

Quote:

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Originally Posted by siavoshkc

I am not sure if such function exists. But you can simply do it yourself if it doesn't.

First sort the array (There is a standard function to do it), and then count distinct enteries.

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Sorting it first... great idea, thanks. :)