A Calculation on list object
On Mon, Jun 6, 2011 at 6:10 PM, Ron Michael <ron_michael70 at yahoo.com> wrote:
Hello, I am into some calculation on a list object, therefore requesting the peers if there is any short cut way to so the same calculation. Let say I have following list object:
List <- vector('list', length = 3)
set.seed(1)
List[[1]] <- rnorm(5)
List[[2]] <- rnorm(2)
List[[3]] <- rnorm(7)
List
[[1]] [1] -0.6264538 ?0.1836433 -0.8356286 ?1.5952808 ?0.3295078 [[2]] [1] -0.8204684 ?0.4874291 [[3]] [1] ?0.7383247 ?0.5757814 -0.3053884 ?1.5117812 ?0.3898432 -0.6212406 -2.2146999
Vector <- 3:5 Vector
[1] 3 4 5 Now, what I want to do is, add List with Vector, element-by-element. Means I wanted to do:
List[[1]] + Vector[1]
[1] 2.373546 3.183643 2.164371 4.595281 3.329508
List[[2]] + Vector[2]
[1] 3.179532 4.487429
List[[3]] + Vector[3]
[1] 5.738325 5.575781 4.694612 6.511781 5.389843 4.378759 2.785300 Till now I have done this calculation with for-loop. Therefore it would be interesting if there is any elegant way to do the same.
Try this:
mapply("+", List, Vector)
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