[R] How to convert a vector into a list

[Uwe Ligges]

S Peri wrote:

> Dear group, 
> Apologies for asking the most chomped FAQ.
> 
> I have a file with list of gene names(genes.txt):
> EGF
> EGFR
> PTPN6
> TIEG2
> MAPK1
> 
> 
> I have another object in R, I do not know the data
> type for that object that looks like this
> ("lidnames"):
> "RABGGTA"   "MAPK3"     "TIE" "CYP2C19" 
> 
> 
> 
>>lidnames[1:10]
> 
>  100_g_at   1000_at   1001_at 1002_f_at 1003_s_at    
> "RABGGTA"   "MAPK3"     "TIE" "CYP2C19"    "BLR1" 
> 
> 
> I want to pick list of genes from lidnames object that
> are in genes.txt.  I am using %in% function.
> 
> 
>>mygenes<-read.table("genes.txt")
> 
> 
>>mygenes[mygenes %in% lidnames]
> 
> NULL data frame with 164 rows
> 
> 
> I am unable to pullout genes from lidnames object.
> 
> Is it because that lidnames is as a list type and
> mygenes object is as a vector/matrix type.

Well, mygenes is a data frame, and lidnames a vector.
E.g., try to read in mygenes as a vector directly:
  mygenes <- scan("genes.txt", what = "character")

Uwe Ligges

> How can I convert mygenes to list type where I can
> have the elements:
> 
> "EGF","EGFR","PTPN6","TIEG2","MAPK1".
> 
> I think in this way I can pull out the names from
> lidnames object or any other complex matrix. 
> 
> Please help me. 
> 
> Thank you
> SP
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html