What I want to do is to be able to select certain FTIStandKey's and change
values in the dataset. For example, I would like to select by
FTIStandKey=="NAH6253-003", and change the entries for CoverType="
XSOP-9999-C " and change the V_SpGrp=="T", and also change V_Origin=="T". I
only want to change the record for the one FTIStandKey. All the other
records need to remain the exact same. I have spent a good bit of time
trying to figure this out but with no success. Any help would be greatly
appreciated.
Do not know if the following will work, and it is not tested since you
don't give a reproducible example, see ?dput and the Posting Guide for
this list. There are several ways of doing what you want, some of which
are possibly more transparent than this:
mydata[mydata$FTIStandKey == "NAH6253-003",
c("CoverType", "V_SpGrp", "V_Origin")] <-
list(" XSOP-9999-C ", "T", "T")
This relies on the fact that if your variables are factors, that they
include the replacement levels already (including the fact that you have
spaces on either side of the string for CoverType... You might also see
?ifelse for another method of dealing with stuff like this.
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