Message-ID: <C7D7986E-0B63-41B3-8393-5194A8C8BAA2@xs4all.nl>
Date: 2013-03-17T20:48:46Z
From: Berend Hasselman
Subject: help with simple function
In-Reply-To: <CANhKaPCDPLznigmnQVS=rOqy9xyrUDr4hjMK0MN55hRiw3wROA@mail.gmail.com>
On 17-03-2013, at 16:47, Miguel Eduardo Delgado Burbano <mdelgadoburbano at gmail.com> wrote:
> 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
>
Write 4*( instead of 4( assuming you want to multiply.
> 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
>
[ is an indexing operator. You are trying to index the number 4. Which is impossible.
Berend
> some suggestion to solve this?? thank you so much for your help
>
> Miguel
>
> [[alternative HTML version deleted]]
>
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