R help - Jul 2013 - IF function

Hi,
May be this helps.? 

dat1<- read.table(text="
Col1,Col2
High value,9
Low value,0
High value,7
Low value,0
Low value,0
No data,0
High value,8
No data,0
",sep=",",header=TRUE,stringsAsFactors=FALSE)
dat1$Col2[dat1$Col1=="No data"]<- NA
?dat1
#??????? Col1 Col2
#1 High value??? 9
#2? Low value??? 0
#3 High value??? 7
#4? Low value??? 0
#5? Low value??? 0
#6??? No data?? NA
#7 High value??? 8
#8??? No data?? NA

A.K.


Hello, 

I am an R novice so excuse me if this is woefully straight forward, but I have
tried the help files to no avail.

I am trying to identify cells in 1 column with the value of 'No data',
so I can change the values in the next column to 'Null'.

Currently I am struggling with the data set, as it assigns both 'No
data' and 'Low values' as zero which skews my analysis.

I've tried a number of different attempts but just get the error unexpected
symbol ?