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...;- function (x) x^2 which is evaluated with : f(2) Now, I want to do the reverse so I want to now x for f(x) = 4 So, is there a way in R to solve x for some function f(x)=a? I hope I explained it clear. cheers, Dennis -- View this message in context: http://www.nabble.com/Function-question-tp20036365p20036365.html Sent from the R help mailing list archive at Nabble.com.