help with simple function
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 [[alternative HTML version deleted]]
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