[R] help with simple function

[arun]

Hi,

 Y1<- 1:4
 Y2<- 5:8

sqrt(var(Y1)+var(Y2)^2)-4*((var(Y1)*(var(Y2)-cov(Y1,Y2)^2)))
#[1] 9.515593
A.K.

----- Original Message -----
From: Miguel Eduardo Delgado Burbano <mdelgadoburbano at gmail.com>
To: r-help at r-project.org
Cc: 
Sent: Sunday, March 17, 2013 11:47 AM
Subject: [R] help with simple function

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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