[R] "reverse" quantile function

[Andras Farkas]

Never mind, I think i figured:

z<-df

apply(df,1,function(x) approx(sort(x[1:4]), seq(0,1,,length(x[1:4])), x[5])$y) 
thanks again for the help
 
Andras Farkas, 


On Friday, June 16, 2017 5:34 AM, Andras Farkas via R-help <r-help at r-project.org> wrote:




Peter, 

thanks, very nice, this will work for me... could you also help with setting up the code to run the on liner "approx(sort(x), seq(0,1,,length(x)), q)$y" on the rows of a data frame using my example above? So if I cbind z and res, 

df<-cbind(z,res) 

the "x" in your one liner would be the first 4 column values of each row and "q" is the last (5fth) column value of each row.. 

thanks again for all the help, 

Andras Farkas

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