[R] How to convert a vector into a list
andy_liaw at merck.com
Thu Aug 19 18:39:30 CEST 2004
1. When you don't know (or are not sure) what an object is, str() is your
2. My guess is that `lidnames' is a character vector with names.
3. If genes.txt has only only column, you might as well use:
mygenes <- scan("genes.txt", what="")
which reads the data into mygenes as a character vector. Then your
command should work.
[read.table() returns a data frame. You index mygenes, a data frame, with a
logical vector, which means selecting columns that are TRUE. I suspect
mygenes, as you have it, is a data frame of only one column, so the
subsetting won't work.]
> From: S Peri
> Dear group,
> Apologies for asking the most chomped FAQ.
> I have a file with list of gene names(genes.txt):
> I have another object in R, I do not know the data
> type for that object that looks like this
> "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[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.
> How can I convert mygenes to list type where I can
> have the elements:
> I think in this way I can pull out the names from
> lidnames object or any other complex matrix.
> Please help me.
> Thank you
> R-help at stat.math.ethz.ch mailing list
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