Re: [R] A calculation in data.frame

HI, May be this helps: library(reshape2)  df1 <- dcast(DF,A2~A1,value.var="A3") z <- function(a,b,c){a+2*b+c}   within(df1, newCol <- z(a,b,c)) #  A2 a b c newCol #1  m 1 4 7 16 #2  n 2 5 8 20 #3  p 3 6 9 24 On Tuesday, January 7, 2014 4:15 PM, Ron Michael wrote: Hi, I have to

Re: [R] A calculation in data.frame

On 14-01-07 3:21 PM, Ron Michael wrote: Hi, I have to perform some formula driven calculation in a data.frame (as defined below). Let say I have following DF: DF <- data.frame(A1 = c('a', 'a', 'a', 'b', 'b', 'b', 'c', 'c', 'c'), A2 = c('m', 'n', 'p', 'm', 'n', 'p', 'm', 'n', 'p'), A3 = c(1,2

[R] A calculation in data.frame

Hi, I have to perform some formula driven calculation in a data.frame (as defined below). Let say I have following DF: > DF <- data.frame(A1 = c('a', 'a', 'a', 'b', 'b', 'b', 'c', 'c', 'c'), A2 = > c('m', 'n', 'p', 'm', 'n', 'p', 'm', 'n', 'p'), A3 = c(1,2,3,4,5,6,7,8,9)) > DF   A1 A2 A3 1  a