[R] Help in using unique count by match function

[arunkumar1111]

Hi

My code looks like this

I have two parameters x and par1. X contains values and par1 contains the
function which i required to  use

if par1 is max then output should be max(x). 

	       FUN <- match.fun(par1)
		result=FUN(x)

Is it possible to incorporate the unique count of x within this code

eg

x=("a","b","a","c")  . The output should be 3 

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Thanks in Advance
        Arun
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