input array in R

Hello please find below mentioned code. What I want is to add values to my array on the basis of certain condition checks which I want to undertake. If the values are eligible, th开发者_如何学Pythonen they should add to array otherwise they should be discarded. However, I am unable to get the required array. Any help in that regard will be of great help.

>NODE_1
[1]GTTGGCCGAGCCCCAGGACGCGTGGTTGTTGAACCAGATCAGGTCCGGGCTCCACTGCACGTAGTCCTCTTCCCAATTTCCCTTAA

>NODE_2
[1] CCTCCGGCGGCACCACGGTCGGCGAGGCCCTCAACATCCTG GAGCGCACCGACCTGTCCACCGCGGACAAGGCCGGTTACCT
GCACCGCTACATCGAGGCCAGCCGCATCGCGTTCGCGGACC 

>NODE_3
[1]GCCCGGCGCCTGGCCGCGGGCGAGTGGGTCGTGGACCTGCGCTCCCGGGTGGCCTTCGCCGCCGGTCACGTCGCCGGG
   TCGCTCAACTTCGAGGCCGACGGACAGCT

My code is:

Length <- function(a)
{
  b<-list()
  for ( i in 1: length(a))
  {
    b[i]<-which(length(a[i])<30, arr.ind = FALSE, useNames = TRUE)
    m<- array(b[i])
  }
}
k<- Length(Y)

So what I want to do is add only those data to array b from Y whose length is less than 30.

you should use nchar() instead of length() to get the number of characters.

And to do it the R way, you could use the boolean index: k <- a[nchar(a)<30]

Hope that helps!