R help - Oct 2015 - How to use curve() with two parameters in the function

Dear R list,

I am trying to plot the curve of a function.

Here's the R code:

library(mvtnorm)

p <- function(x, mu){
   mu <- c(mu, 0)
   dmvnorm(c(x, 1), mu, diag(2))
}
> curve(p(x, 2), from = 0, to =1)
Error in dmvnorm(c(x, 1), mu, diag(2)) :
  mean and sigma have non-conforming size

I think my matrix probably have different size inside curve(), maybe I need
to use apply()?  I am not sure.

Thanks so much!

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Never mind, I figured it out.

You need to use sapply(), for instance, curve(sapply(x, p), from = 0, to
=10)

Thanks all!

On Tue, Oct 27, 2015 at 11:14 AM, C W <tmrsg11 at gmail.com> wrote:
> Dear R list,
>
> I am trying to plot the curve of a function.
>
> Here's the R code:
>
> library(mvtnorm)
>
> p <- function(x, mu){
>    mu <- c(mu, 0)
>    dmvnorm(c(x, 1), mu, diag(2))
> }
>
> > curve(p(x, 2), from = 0, to =1)
> Error in dmvnorm(c(x, 1), mu, diag(2)) :
>   mean and sigma have non-conforming size
>
> I think my matrix probably have different size inside curve(), maybe I
> need to use apply()?  I am not sure.
>
> Thanks so much!
>
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