Re: [R] D(dnorm...)?

From: Berton Gunter <gunter.berton_at_gene.com>
Date: Thu 26 Jan 2006 - 09:57:33 EST


dnorm() is an internal function, so I don't see how D (or deriv) can do anything with it symbolically. Am I missing something?

> -----Original Message-----
> From: r-help-bounces@stat.math.ethz.ch
> [mailto:r-help-bounces@stat.math.ethz.ch] On Behalf Of Spencer Graves
> Sent: Wednesday, January 25, 2006 2:43 PM
> To: r-help@stat.math.ethz.ch
> Subject: [R] D(dnorm...)?
>
> Can someone help me understand the following:
>
> > D(expression(dnorm(x, mean)), "mean")
> [1] 0
> > sessionInfo()
>
> R version 2.2.1, 2005-12-20, i386-pc-mingw32
>
> attached base packages:
> [1] "methods" "stats" "graphics" "grDevices" "utils"
> "datasets"
> [7] "base"
>
> By my computations, this should be something like
> ((mean-x)/sd^2)*dnorm(...).
>
> Thanks for your help.
> Spencer Graves
>
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R-help@stat.math.ethz.ch mailing list
https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html Received on Thu Jan 26 10:04:15 2006

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