[R] how to speed up the process of R

[mrzung]

hi
 I'm simulating some experiment by "for" function.
The problem is that it takes too much time.

for example,

a<-list()

for(i in 1:100000000){
a[[i]]<-i*1000
}

is there anyway to speed up the process?
I heard there is solution but i don't have idea.

Can anyone help me?

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