[R] Help

[zilefacelvis at yahoo.com]

   Hi A.K,

   Thanks for  this great help. I wish to find -999.99M and replace with NA.
   All others like T, A, F etc should be deleted from the files.


   Thanks for much.
   ------ Original Message ------

     From : arun
     To : Zilefac Elvis;
     Cc : R help;
     Sent : 27-04-2013 16:29
     Subject : Re: [R] Help

HI,

"Find 'T','C','A','F' and 'Y', delete them from all the 110 files"
I assume that you meant to replace it with NA.


set.seed(28)
myfiles<- lapply(1:5,function(i) as.data.frame(matrix(sample(c(LETTERS,"-999.99
M"),40*i,replace=TRUE),ncol=(40*i)/8),stringsAsFactors=FALSE))
 myfiles[[1]]
#  V1 V2       V3 V4 V5
#1  A  P        K  O  Y
#2  C  Z        S  M  Y
#3  M  S -999.99M  G  I
#4  X  R        M  G  X
#5  C  Q        G  A  P
#6  U  W        G  B  K
#7  A  N        Z  X  R
#8  X  I        F  M  K


res<-lapply(myfiles,function(x) {x1<-unlist(x); x1[x1%in% c("-999.99M","T","C",
"A","F","Y")]<-NA;as.data.frame(matrix(x1,ncol=ncol(x)),stringsAsFactors=FALSE)
})

res[[1]]
 #   V1 V2   V3   V4   V5
#1   P    K    O 
#2   Z    S    M 
#3    M  S     G    I
#4    X  R    M    G    X
#5   Q    G     P
#6    U  W    G    B    K
#7   N    Z    X    R
#8    X  I     M    K

lapply(seq_along(res),function(i) write.table(res[[i]],paste0("file",i,".txt"),
row.names=FALSE,quote=FALSE))
A.K.


----- Original Message -----
From: Zilefac Elvis 
To: "r-help at r-project.org" 
Cc: 
Sent: Saturday, April 27, 2013 11:20 AM
Subject: [R] Help

Hello,



I have a question and need your help urgently. I am new to R but want to learn 
it.

I have several files in a folder which I have imported to R using :
temp = list.files(pattern="*.txt")
>myfiles = lapply(temp, read.delim)
The resulting files are on the workspace stored as List[110]. So they are 110 f
iles in the list. Each file has several different columns and rows.
My question: I would like to find and replace -999.99M with NA; Find 'T','C','A
','F' and 'Y', delete them from all the 110 files.
Then, I want to write.table all the corrected files back to a folder on my comp
uter.
Thanks for your help.
Atem.
 


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