extract data from array names
extract data from array names
name2factor(x, sep = "_", which, collapse = sep, as.factor = TRUE) name2num(x, sep = "_", which, collapse = sep, dif = TRUE)
x |
data, can be a three-dimensional array, a matrix, a named list or a vector containing names to split |
sep |
character by which to split the strings |
which |
integer or vector of integers, if more entries are selected, they will be concatenated by the string specified with the option 'collapse'. |
collapse |
character by which to collapse data if two strings are to be concatenated |
as.factor |
logical: if TRUE, a factor vector will be returned, strings otherwise. |
dif |
logical: calculate difference if two fields containing numbers are selected. |
extract data from array names and convert to factors or numbers
If an array is used as input, the data info is expected to be in the 3rd dimension, for a matrix, rownames are used.
returns a vector containing factors or numbers
Stefan Schlager
data <- matrix(rnorm(200),100,2)
id <- paste("id",1:100,sep="")
pop <- c(rep("pop1",50),rep("pop2",50))
sex <- c(rep("male",50),rep("female",50))
age <- floor(rnorm(100,mean=50,sd=10))
rownames(data) <- paste(id,pop,sex,age,sep="_")
infos <- data.frame(pop=name2factor(data,which=2))
infos$age <- name2num(data,which=4)
infos$pop.sex <- name2factor(data,which=2:3)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.