CODEWITHSUNDEEP
r
kittygirl
kittygirl

Reputation: 2443

How to loop the names of a list?

target<-data.frame(q01=1,q03=1:10)
total<-list(t1=c('q02','q05'),t2=c('q01','q04'),t3=c('q03','q06'))

for(m in colnames(target)){
  for(j in total){
    print(names(j))
  }
}

When I run above script,result is:

NULL
NULL
NULL
NULL
NULL
NULL

My expect result is:

t1
t2
t3
t1
t2
t3

I cannot find out the problem,names(j) seemed not workable in loop.
Where is the problem?

Upvotes: 0

Views: 36

Answers (1)

Ronak Shah
Ronak Shah

Reputation: 389235

Iterate over the index of the list instead of the entire list :

for(m in colnames(target)){
   for(j in seq_along(total)) {
     print(names(total)[j])
   }
}

#[1] "t1"
#[1] "t2"
#[1] "t3"
#[1] "t1"
#[1] "t2"
#[1] "t3"

Upvotes: 1

Related Questions