[R] First value in a row

[arun]

Hi,

Try this:

dat1<-read.table(text="
Lat  Lon  x1  x2  x3
01    10  NA  NA  .1
01    11  NA  .2  .3
01    12  .4  .5  .6
",sep="",header=TRUE)

dat2<-dat1[,3:5]
 dat3<-data.frame(dat1,NewColumn=rev(unlist(lapply(dat2,function(x) x[!is.na(x)][1]))))
row.names(dat3)<-1:nrow(dat3)
 dat3
  Lat Lon  x1  x2  x3 NewColumn
1   1  10  NA  NA 0.1       0.1
2   1  11  NA 0.2 0.3       0.2
3   1  12 0.4 0.5 0.6       0.4

A.K.




----- Original Message -----
From: Camilo Mora <cmora at dal.ca>
To: r-help at r-project.org
Cc: 
Sent: Tuesday, July 24, 2012 2:48 AM
Subject: [R] First value in a row

Hi.

This is likely a trivial problem but have not found a solution. Imagine the following dataframe:

Lat   Lon  x1   x2  x3
01    10   NA   NA  .1
01    11   NA   .2  .3
01    12   .4   .5  .6

I want to generate another column that consist of the first value in each row from columns x1 to x3. That is

NewColumn
.1
.2
.4

Any input greatly appreciated,

Thanks,

Camilo


Camilo Mora, Ph.D.
Department of Geography, University of Hawaii

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