[R] some questions

[Ales Ziberna]

Firstly, these are all very basic questions, thah you coukld probobly answer 
yourself by searching the manual and help files. Nevertheless, here are the 
answers to give you a little head start.

> Dear R expert,
> The following is my questions:
>
> 1. How to generate two sequences of 150 uniform
> deviates, called v1 and v2, in the range [-1,1].
v1<-runif(n=150,min=-1,max=1)
v2<-runif(n=150,min=-1,max=1)

> 2. How to compute  r=(v1)^2+(v2)^2
r<-(v1)^2+(v2)^2

> 3.If r is outside the range of (0,1) then it will be
> discarded.
newr<-r[r<1]
newr<-newr[r>0]

> 4 How to compute (v1)*sqrt(-2*log(r)/r) and output the
> first 100 z values in the list.
z<-(v1)*sqrt(-2*log(r)/r)
z[1:100] #or
print(z[1:100])

> 5. Plot histograms for the sequences from steps 1 and
> 2.
hist(v1)
hist(v2)
hist(r)

>
> Thanks very much for your help!
I hope this helps,

Ales Ziberna

>
> xingyu
>
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