vectorised recovery of strsplit value ??
There are several ways to get a matrix, for example mat = as.matrix(as.data.frame(splitIDs)) or mat = sapply(splitIDs, I) True experts may suggests even more ways. Peter
On Wed, Dec 22, 2010 at 1:02 PM, maddox <matthewgdodds at hotmail.com> wrote:
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.
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