Split
Sometimes it just makes more sense to pre-process your data and get it into the format you need. It just depends on whether you are more comfortable programing in R or in some other text manipulation language like bash/sed/awk/grep etc. If you know how to do this with other tools, you could write a script and probably call the script from R. I could post a sample if you are interested. LMH
Val wrote:
HI All,
I am trying to create new columns based on another column string
content. First I want to identify rows that contain a particular
string. If it contains, I want to split the string and create two
variables.
Here is my sample of data.
F1<-read.table(text="ID1 ID2 text
A1 B1 NONE
A1 B1 cf_12
A1 B1 NONE
A2 B2 X2_25
A2 B3 fd_15 ",header=TRUE,stringsAsFactors=F)
If the variable "text" contains this "_" I want to create an indicator
variable as shown below
F1$Y1 <- ifelse(grepl("_", F1$text),1,0)
Then I want to split that string in to two, before "_" and after "_"
and create two variables as shown below
x1= strsplit(as.character(F1$text),'_',2)
My problem is how to combine this with the original data frame. The
desired output is shown below,
ID1 ID2 Y1 X1 X2
A1 B1 0 NONE .
A1 B1 1 cf 12
A1 B1 0 NONE .
A2 B2 1 X2 25
A2 B3 1 fd 15
Any help?
Thank you.
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