Hello,
You are missing a '*' in your first try.
(As for the second, in R parenthesis are round, not [])
sqrt(var(Y1) + var(Y2))^2 - 4*(var(Y1)*(var(Y2) - cov(Y1, Y2)^2))
This written as a function becomes
fun <- function(Y1, Y2)
sqrt(var(Y1) + var(Y2))^2 - 4*(var(Y1)*(var(Y2) - cov(Y1, Y2)^2))
x1 <- rnorm(10)
x2 <- rnorm(10)
fun(x1, x2)
Hope this helps,
Rui Barradas
Em 17-03-2013 15:47, Miguel Eduardo Delgado Burbano escreveu:
hello all
I am writing a quite simple script to study dental wear patterns in humans
and I wrote this function
sqrt(var(Y1)+var(Y2))^2-4(var(Y1)*(var(Y2)-cov(Y1,Y2)^2)) but appear this
error message
Error: attempt to apply non-function
alternatively I wrote this
sqrt(var(Y1)+var(Y2)^2)-4[(var(Y1)*(var(Y2)-cov(Y1,Y2)^2))]
but this error message appear
[1] NA
Warning message:
NAs introduced by coercion
some suggestion to solve this?? thank you so much for your help
Miguel
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