[R] multiplying list with vector

[Dimitris Rizopoulos]

One option is mapply(), e.g.,

mylist <- list("v1"=c(1,2,2,1), "v2"=c(2,2,2,1), "v3"=c(1,1,1,1))
myvector <- c(100, 10000, 1000000)

mapply("*", mylist, myvector)
mapply("*", mylist, myvector, SIMPLIFY = FALSE)


I hope it helps.

Best,
Dimitris



On 9/29/2011 11:43 AM, Marion Wenty wrote:
> hello everybody,
>
> i have got a question about lists:
>
> i have got the following commands:
>
> mylist<- list("v1"=c(1,2,2,1),"v2"=c(2,2,2,1),"v3"=c(1,1,1,1))
> myvector<- c(100,10000,1000000)
>
> now i would like to multiply each element of the list with the corresponding
> element of the vector, that is to say:
> v1*100
> v2*10000
> v3*1000000
> i only could think of lapply which can only be used to multiply each element
> of the list with the same number, i think.
>
> thank you very much in advance for your help,
> marion
>
> 	[[alternative HTML version deleted]]
>
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-- 
Dimitris Rizopoulos
Assistant Professor
Department of Biostatistics
Erasmus University Medical Center

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