# [R] Help needed

Sascha Vieweg saschaview at gmail.com
Thu Jan 27 15:12:41 CET 2011

```On 11-01-27 13:16, Ben Boyadjian wrote:

> Hello I am trying to solve these problems and I am not allowed to use loops or ifs.
>
> 1st Question
> My first question is that I have generated 100 random numbers from the uniform distribution then
> A)add only the negative integers.

x <- c(1, 1.3)
x==round(x, 0)

> B)add elements until the first appearance of a negative element.

y <- c(1, 3, 7, -2, 3, -7)
sum(y[1:which(y<0)[1]-1])

> I know how to choose the negative elements for A but how to find integers?
> And I dont know what to do for B.
>
> 2nd Question Simulate 1000 observations from the student-t
> distribution with 3 degrees of freedom and then calculate the
> truncated mean by excluding bottom 5% and top 5%.

Dono. Ideas?

> Thank yoou
>
>
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