Skip to content

function for filtering and deleting vector entries

3 messages · babyluck, Rui Barradas, andrija djurovic

babyluck
# 
Dear helpers

I have two data sets saved as vectors (temperature and velocity). Now I need
to "take out" a span of temperature and its corresponding velocity in the
other vector. How can I achieve that? 

I tried to write a function,which takes a vector entry and then decides
wether to delete the temperature entry or not and  simultaneously doing so
with same entry in the velocity vector..
But somehow it's not working...could somebody please help me? 
Thanks a lot..


norm = function(Temp,v){
	for (i in 1:length(Temp)){
		
		if (Temp[i]<=16 || Temp[i] >= 38.5)
		 {Temp[-i];v[-i]}

		return(Temp,v)
	}
}


--
View this message in context: http://r.789695.n4.nabble.com/function-for-filtering-and-deleting-vector-entries-tp4432410p4432410.html
Sent from the R help mailing list archive at Nabble.com.
Rui Barradas
# 
Hello,


babyluck wrote
Your function is not changing 'Temp' nor 'v', just choosing subsets of them.
And you 'return' at the end of the first iteration...
(And you can only return one value)

Try


fun <- function(Temp, v){
	unwanted <- Temp <= 16 | Temp >= 38.5
	Temp <- Temp[!unwanted]
	v <- v[!unwanted]
	list(Temp=Temp, v=v)
}

(tt <- seq(10, 40, by=0.5))
(vv <- 1:length(tt))
fun(tt, vv)

I've changed the name because 'norm' is a  R function name. See ?norm

Hope this helps,

Rui Barradas


--
View this message in context: http://r.789695.n4.nabble.com/function-for-filtering-and-deleting-vector-entries-tp4432410p4432772.html
Sent from the R help mailing list archive at Nabble.com.
andrija djurovic
# 
Hi.

Maybe this will help you:

set.seed(1)
temp <- 1:100
v <- rnorm(100)

temp[temp<16 | temp>38]
v[temp<16 | temp>38]

Andrija
On Wed, Feb 29, 2012 at 7:09 PM, babyluck <madruga at gmx.ch> wrote: