[R] vectorised recovery of strsplit value ??

[maddox]

Dear Guru's

My first steps with R have ground to a halt! I have a vector of sample
identifiers

> sampleIDs
 [1] "D1_1"   "D1_2"   "D1_3"   "D1_4"   "D1_5"   "D1_6"   "D1_7"   "D1_8"  
 [9] "D1_9"   "D1_10"  "D1_11"  "D1_12"  "F1_13"  "F1_14"  "F1_15"  "F1_16" 
[17] "F1_17"  "F1_18"  "F1_19"  "F1_20"  "F1_21"  "F1_22"  "F1_23"  "F1_24" 
[25] "DDC_25" "DDC_26" "DDC_27" "DDC_28" "DDC_29" "DDC_30" "DDC_31" "DDC_32"
[33] "DDC_33" "DDC_34" "DDC_35" "DDC_36"

from which I've split the prefix identifier using strsplit

> splitIDs <- strsplit( as.character(sampleIDs), "_")
> splitIDs
[[1]]
[1] "D1" "1" 

[[2]]
[1] "D1" "2" 

[[3]]
[1] "D1" "3" 

[[4]]
[1] "D1" "4"  etc

I am now struggling to work with the prefix identifiers (D1, F1, DDC)
because the only way I have figured out to access them is with
splitIDs[[i]][1] i.e. it seems like I have to use a loop to get the
identifiers into a factor and counted. 

Is there a vectorised solution someone can suggest? 
Or an alternative strategy .. these are early days using R for me!
Thanks


regards

M



-- 
View this message in context: http://r.789695.n4.nabble.com/vectorised-recovery-of-strsplit-value-tp3161254p3161254.html
Sent from the R help mailing list archive at Nabble.com.