search for: chr13

Hello,   I have a dataframe: dd <- data.frame(b = c("chr2", "chr1", "chr15", "chr13"),         x = c("A", "D", "A", "C"), y = c(8, 3, 9, 9),         z = c(1, 1, 1, 2))   >dd       b x y z 1  chr2 A 8 1 2  chr1 D 3 1 3 chr15 A 9 1 4 chr13 C 9 2 Now I want to sort them according column "b", but only its number is considered...

Hi R experts. how can I average two sets of columns? dd <- data.frame(b = c("chr2", "chr1", "chrY", "chr13", "chrX"),         w=11:15, x = 1:5, y = c(8, 3, 9, 9,7),        z = c(1, 1, 1, 2, 8)) expected result for mean(w,x) and mean(y,z) is 1  chr2 6  4.5 2  chr1 7  2 3  chrY 8  5 4 chr13 9  5.5 5  chrX 10 7.5 Yu [[alternative HTML version deleted]]

...7 3 chr11 11767950 11768676 8 4 chr11 11840900 11841851 8 5 chr11 12267450 12268076 12 6 chr11 12276675 12277051 7 > dput(mydata) structure(list(chrom = structure(c(3L, 3L, 3L, 3L, 3L, 3L), .Label = c("chr1", "chr10", "chr11", "chr12", "chr13", "chr14", "chr15", "chr16", "chr17", "chr18", "chr19", "chr2", "chr3", "chr4", "chr5", "chr6", "chr7", "chr8", "chr9", "chrX"), class = "f...

...me that contains chrom length 1 chr1 249250621 2 chr2 243199373 3 chr3 198022430 4 chr4 191154276 5 chr5 180915260 6 chr6 171115067 7 chr7 159138663 8 chrX 155270560 9 chr8 146364022 10 chr9 141213431 11 chr10 135534747 12 chr11 135006516 13 chr12 133851895 14 chr13 115169878 15 chr14 107349540 16 chr15 102531392 17 chr16 90354753 18 chr17 81195210 19 chr18 78077248 20 chr20 63025520 21 chrY 59373566 22 chr19 59128983 23 chr22 51304566 24 chr21 48129895 I want to drop the "chr" and order the chrom column in ascending order with X...

...I'm not sure if either of these questions is a simple task or incredibly time consuming and inappropriate to ask a message board. If you can offer any advice though, I would really appreciate it! Thanks, Mark -------------- next part -------------- A non-text attachment was scrubbed... Name: Chr13.png Type: image/png Size: 7618 bytes Desc: Chr13.png URL: <https://stat.ethz.ch/pipermail/r-help/attachments/20120316/ec3d18e3/attachment.png>

...sequence query.minus <- reverseComplement(query.plus) chrList <- c("chr1", "chr2", "chr3", "chr4", "chr5", "chr6", "chr7", "chr8", "chr9", "chr10", "chr11", "chr12", "chr13", "chr14", "chr15", "chr16", "chr17", "chr18", "chr19", "chr20", "chr21", "chr22", "chrX", "chrY") #access/group the by subset of annotation annotGr <- exons(txdb) #annotGr <- c...