[R] using lapply to get function values
Long Vo
long_vo_hai at yahoo.com.vn
Fri Jan 10 08:04:49 CET 2014
Hi R users,
I need to apply a function on a list of vectors. This is simple when I use
functions that returns only one numerical value such as 'mean' or
'variance'. Things get complex when I use functions returning a list of
value, such as 'acf'.
In the following example I first create a list of vectors with equal length
10. Then I try to get the first order autocorrelation coefficient of each
vector using lapply:
#####
library(stats)
X=rnorm(1:100)
Y=split(X,as.numeric(gl(length(X),10,length(X))))# to divide X into 10
sub-vectors
app=lapply(Y,FUN=acf,lag.max=1,plot=F)
app
#####
I need to know how to display other values of the function e.g. 'type',
'lag' not just 'acf'. Because using
####
app=lapply(Y,FUN=acf$type,lag.max=1,plot=F)
####
prompts the error "object of type 'closure' is not subsettable"
Note that this is only an illustrative example. The function I am studying
is not 'acf', but it also return a list of values and I need to call out
specific values.
Helps and comments are welcome.
Long
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