[R] How to translate string to variable inside a command in an easy way in R

[UriB]

I want to write a function that get 2 strings y and z and does the following
R command.

temp<-qq1[qq1$z==y,]
for example if it get y="AMI" and z="PrimaryConditionGroup"
It should do the following
temp<-qq1[qq1$PrimaryConditionGroup=="AMI",]

I could do it by the following function that is ugly and I wonder if there
is an easier way to do it espacielly when temp is not the final result that
I want (so I practically do not have temp<<-temp because I do not need the
function to remember temp but only to remember something else that is
calculated based on temp).

ugly<-function(y,z)
{
  text1<-paste("temp<-qq1[qq1$",z,sep="")
  text1<-paste(text1,"==y",sep="")
  text1<-paste(text1,",]",sep="")
  eval(parse(text=text1))
  temp<<-temp
}


 

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