Odp: Filtering R lists
Hi r-help-bounces at r-project.org napsal dne 04.03.2009 13:18:30:
Hello I am am new to R and any help with the following would be appreciated: I have a list (example attached) and I would like to create a new list which is a filtered version of this list. I.e I would like a list that only contains elements with this value: Chr 10 : 21853562 - 21855482
Lists can have quite complicated structure so here is only a small suggestion lapply(your.list, function(x) x==desired.value) This shall give you list of logical values if your list has only one level. Something like pts <- list(x=mtcars[,1], y=mtcars[,2], z=mtcars[,10]) pts[which(unlist(lapply(pts, function(x) sum(x==4)>0)))] Regards Petr
Any pointers/tips would be great. Thanks! Nikol -- Bioinformatician/Computer Associate Cambridge Institute for Medical Research University of Cambridge Wellcome Trust/MRC Building Hills Road Cambridge CB2 0XY 01223 762111 [[1]] human../US45102804_251757910002_S01_CGH-v4_95_Feb07.chr10.cher1 Chr 10 : 21853562 - 21855482 Antibody : ./US45102804_251757910002_S01_CGH-v4_95_Feb07 Maximum level = 0.5370385 Score = 3.193875 Spans 19 probes. Defined extras: typeUpstream, typeInside, distMid2TSS, upSymbol,
inSymbol, type
[[2649]] human../US45102804_252058310010_S01_CGH-v4_95_Feb07.chrX.cher18 Chr X : 72387424 - 72387712 Antibody : ./US45102804_252058310010_S01_CGH-v4_95_Feb07 Maximum level = 0.3504706 Score = 0.4045575 Spans 4 probes. Defined extras: typeUpstream, typeInside, distMid2TSS, upSymbol,
inSymbol, type
[[2650]] human../US45102804_252058310010_S01_CGH-v4_95_Feb07.chrX.cher19 Chr X : 129037305 - 129037494 Antibody : ./US45102804_252058310010_S01_CGH-v4_95_Feb07 Maximum level = 0.4718157 Score = 0.5751177 Spans 3 probes. Defined extras: typeUpstream, typeInside, distMid2TSS, upSymbol,
inSymbol, type
[[2651]] human../US45102804_252058310010_S01_CGH-v4_95_Feb07.chrX.cher20 Chr X : 129048386 - 129048865 Antibody : ./US45102804_252058310010_S01_CGH-v4_95_Feb07 Maximum level = 0.3711013 Score = 0.4121159 Spans 5 probes. Defined extras: typeUpstream, typeInside, distMid2TSS, upSymbol,
inSymbol, type
[[2652]] human../US45102804_252058310010_S01_CGH-v4_95_Feb07.chrX.cher21 Chr X : 129065300 - 129066038 Antibody : ./US45102804_252058310010_S01_CGH-v4_95_Feb07 Maximum level = 0.4387153 Score = 1.515073 Spans 8 probes. Defined extras: typeUpstream, typeInside, distMid2TSS, upSymbol,
inSymbol, type
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