[R] get index of current element in vector

[Rui Barradas]

Hello,

Just learning the alphabet? If yes, there's a difference between 'v' and 
'a'.

Now more seriously. Your description and your loop don't do the same.

Description:
vm <- scalar * v * seq_along(v)

Loop:
a <- scalar * a

Also, seq_along is the way to do it, it works even if length(a) == 0.

Hope this helps,

Rui Barradas

Em 04-06-2012 21:25, Erdal Karaca escreveu:
> (Just learning R)
>
> I have this vector:
>
> v<- c(1:10)
>
> Now, I want to multiply each element of that vector with a scalar value
> multiplied with its index:
>
> vm<- v * scalar * indexOfCurrentElementOf_v
>
> Is that possible without using a loop?
>
> In a loop I would do this:
>
> for (i in 1:length(a)) a[i]<- scalar * a[i]
>
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