Hello list,
I read in a txt file using
<B<-read.table(file="data.snp",header=TRUE,row.names=NULL)
by specifying the row.names=NULL so that the rows are numbered.
Below is an example after how the table looks like using
<B[1:10,1:3]
SNP Chromosome PhysicalPosition
1 SNP_A-1909444 1 7924293
2 SNP_A-2237149 1 8173763
3 SNP_A-4303947 1 8191853
4 SNP_A-2236359 1 8323433
5 SNP_A-2205441 1 8393263
6 SNP_A-1909445 1 7924293
7 SNP_A-2237146 2 8173763
8 SNP_A-4303946 2 8191853
9 SNP_A-2236357 2 8323433
10 SNP_A-2205442 2 8393263
I am wondering if there is a way to return the start and end row numbers
for a subset of rows.
For example, If I specify B[,2]=1, I would like to get
start=1 and end=6
if B[,2]=2, then start=7 and end=10
Is there any way in R to quickly do this?
Thanks a bunch!
Allen
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