[R] Split values in vector

[Johannes Radinger]

Hello all,

I think I am now on the way to correctly split the vector as I want it
using for loops.
I got now to a point where I got stucked....So maybe someone can help
me out...

Remember the result I am looking for should look like (for
the input vector I want to split see below: var3)

var1  var2  var3_00   var3_01   var3_02   var3_04
1     A     1         0         0         0
2     B     0         1         3         1
3     C     0         2         1         0
4     D     0         0         0         12
5     E     NA        NA        NA        NA

The input and my approach so far:
It is probably not the most elegant solution but I think I will get
where I want..I am very open for your improvements:

var1 <-seq(1,5)
var2 <-c("A","B","C","D","E")
var3 <-c("00","01-1;02-3;04-1","01-2;02-1","01-0;04-2",NA)

x <- data.frame(var1,var2,var3)

#create new columns and prefill with 0
x$var3_01 <- 0
x$var3_02 <- 0
x$var3_03 <- 0
x$var3_04 <- 0

a <- strsplit(as.character(x$var3), split = ";", fixed = TRUE)

for (i in 1:length(a)){
	A <- length(a[[i]])
	for (j in 1:A){
		column <- (unlist(strsplit((a[[i]][j]), split="-",fixed=TRUE))[1])
		if(column!="00"){
			value <- (unlist(strsplit((a[[i]][j]), split="-",fixed=TRUE))[2])
			print(column)
			print(value)
			if(is.na(column)) {
				x$var3_01[i] <- NA
				x$var3_02[i] <- NA
				x$var3_03[i] <- NA
				x$var3_04[i] <- NA
			} else
				if(column %in% c("01","02","03","04")) {
					#print(paste("x$var3_",column,sep=""))
					(paste("x$var3_",column,sep=""))[i]<- as.numeric(value)
				} else print("Problem with category")
		}
	}
}

I think there is a problme with (paste("x$var3_",column,sep=""))[i]
which is not recognized correctly as it is interpreted as a string.

Thank you...

best regards,

/johannes



-------- Original-Nachricht --------
> Datum: Thu, 19 Jan 2012 13:42:24 +0100 (MET)
> Von: Gerrit Eichner <Gerrit.Eichner at math.uni-giessen.de>
> An: Johannes Radinger <JRadinger at gmx.at>
> CC: R-help at r-project.org
> Betreff: Re: [R] Split values in vector

> Hi, Johannes,
> 
> maybe
> 
> X <- unlist( strsplit( as.character( x$ART), split = ";", fixed = TRUE))
> X <- strsplit( X, split = "-", fixed = TRUE)
> 
> X <- sapply( X, function( x)
>                   if( length(x) == 2)
>                    rep( x[1], as.numeric( x[2])) else x[1]
>              )
> 
> table(X, useNA = "always")
> 
> 
> comes close to what you want.
> 
>   Hth  --  Gerrit
> 
> 
> On Thu, 19 Jan 2012, Johannes Radinger wrote:
> 
> > Hello,
> >
> > I have a vector which looks like
> >
> > x$ART
> > ...
> 
> > [35415] 00                        01-1;02-1;05-1;
> > [35417] 01-1;                     01-1;02-1;
> > [35419] 01-1;                     00
> > [35421] 01-1;04-1;                05-1;
> > [35423] 02-1;                     01-1;02-1;
> > [35425] 01-1;02-1;                <NA>
> > [35427] 01-1;                     <NA>
> > ...
> >
> >
> > This is a vector I got in this format. To explain it:
> > there are several categories (00,01,02 etc) and its counts (values after
> -)
> > So I have to split each value and create new dataframe-columns/vectors
> > for each categories one column and the value should be then in the
> > corresponding cell. I know that this vector has 7 categories (00-06)
> > and NA values but each case (row) has not all the categories (as you can
> see).  How can do such as split?
> >
> > In the end I should get:
> > x$ART_00, x$ART_01, x$ART_03,... with its values. In the case of <NA>
> all the categories should have also <NA>.
> >
> > Maybe someone can help.
> >
> > Thank you,
> >
> > Best regards
> >
> > Johannes
> >
> >
> >
> > -- 
> > "Feel free" - 10 GB Mailbox, 100 FreeSMS/Monat ...
> >
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