[R] Help

[Jeff Newmiller]

What do you mean when you say "deleted from the files"? You are discussing using space delimited files. What do you want to occupy the places where those letters are?
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Sent from my phone. Please excuse my brevity.

"zilefacelvis at yahoo.com" <zilefacelvis at yahoo.com> wrote:

>
>   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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