[R] p-value for y in non-parametric distribution, Y

[Sascha Vieweg]

Hello, knowing that some index y, with y(341)=2, SE=3, is 
t-distributed, I (think I) can find an appropriate 
(left/one-sided) p-value with

R: y <- 2
R: yse <- 3
R: (p <- 1-pt(y/yse, df=341))

Now, some simulation resulted in the non-parametric distribution, 
Y, of my index, y:

R: Y <- rnorm(21277)

How can I find the p-value of y then? Simply counting? Thanks, *S*

-- 
Sascha Vieweg, saschaview at gmail.com