[R] How to Store the executed values in a dataframe & rle function

[sujitha]

Hi group, 

This is how my test file looks like: 
Chr start end sample1 sample2 
chr2 9896633 9896683 0 0 
chr2 9896639 9896690 0 0 
chr2 14314039 14314098 0 -0.35 
chr2 14404467 14404502 0 -0.35 
chr2 14421718 14421777 -0.43 -0.35 
chr2 16031710 16031769 -0.43 -0.35 
chr2 16036178 16036237 -0.43 -0.35 
chr2 16048665 16048724 -0.43 -0.35 
chr2 37491676 37491735 0 0 
chr2 37702947 37703009 0 0 

This is the output that I am expecting: 
Sample Chr Start End Values Probes 
sample1 chr2 9896633 14404502 0 4 
sample1 chr2 14421718 16048724 -0.43 4 
sample1 chr2 37491676 37703001 0 2 
sample2 chr2 9896633 9896690 0 2 
sample2  chr2 14314039 16048724 -0.35 6 
sample2 chr2 37491676 37703009 0 2 

Here the Chr value is same but can be any other value aswell so unique among
the similar values. The Start for the first line would be the least value
until values are similiar (4) then the end would be highest value. The
values is the unique value among the common values and probes is number of
similar values. 

Code: 
>m<-read.table("test.txt",sep='\t',header=TRUE,colClasses=c('character','integer','integer','numeric','numeric'))
#reading the test file 
>s<-data.frame(c(rle(m$Sample1)[[2]],rle(m$Sample2)[[2]]),c(rle(m$Sample1)[[1]],rle(m$Sample2)[[1]])) 
# to get the last 2 columns 
> names(s)=c("Values","Probes") 
>G=1 
> for(i in 1:length(s$Probes)){ 
+ if(G==1){first<-unique(m$Chr[G:s$Probes[i]]) 
+ second<-min(m$Start[G:s$Probes[i]]) 
+ third<-max(m$End[G:s$Probes[i]]) 
+ c<-cbind(first,second,third,s$Values[i],s$Probes[i]) 
+ print (c) 
+ G=(G+s$Probes[i])} 
+ else if((G-1) < length(m$Sample1)) { 
+ first<-unique(m$Chr[G:(G+s$Probes[i]-1)]) 
+ second<-min(m$Start[G:(G+s$Probes[i]-1)]) 
+ third<-max(m$End[G:(G+s$Probes[i]-1)]) 
+ c<-cbind(first,second,third,s$Values[i],s$Probes[i]) 
+ print (c) 
+ G=(G+s$Probes[i])} 
+ else { 
+ G=1 
+ first<-unique(m$Chr[G:s$Probes[i]]) 
+ second<-min(m$Start[G:s$Probes[i]]) 
+ third<-max(m$End[G:s$Probes[i]]) 
+ c<-cbind(first,second,third,s$Values[i],s$Probes[i]) 
+ print (c) 
+ G=(G+s$Probes[i])} 
+ } 
so the output is: 
     first  second    third             
[1,] "chr2" "9896633" "14404502" "0" "4" 
     first  second     third                 
[1,] "chr2" "14421718" "16048724" "-0.43" "4" 
     first  second     third             
[1,] "chr2" "37491676" "37703009" "0" "2" 
     first  second    third             
[1,] "chr2" "9896633" "9896690" "0" "2" 
     first  second     third                 
[1,] "chr2" "14314039" "16048724" "-0.35" "6" 
     first  second     third             
[1,] "chr2" "37491676" "37703009" "0" "2" 

I get almost the required output but just need 3 modifications to this code: 
1) Since this is just a small part of the file (with 2 samples), but my
actual file has 150 samples, so how do I write rle function for that? 
2) How do I store all the executed c values as a dataframe (here I am just
printing the values)? 
3) How do I include sample name in execution? 
Waiting for your reply , 
Thanks, 
Suji 


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