Hi,
which packages do you have attached? Look for example at the output of
sessionInfo().
For your code you need the function "fitted" and its S3 methods from
package "stats". So there is no reason why "flexmix" should
be
necessary. However, in "flexmix" S4 methods for "fitted" are
provided
and the S3 methods from "stats" are imported using the following in
the
NAMESPACE:
importFrom(stats, fitted)
I can only guess that the problem might occur because you have for
example "VGAM" attached. I can run your code if "VGAM" is
not attached.
The code does not work after loading "VGAM" and works again after also
loading "flexmix":
> n = 20
> set.seed(86)
> x = sort(runif(n))
> y = sort(runif(n))
> library(splines)
> fit = lm(y ~ ns(x, df=5))
> plot(x, y)
> lines(x, fitted(fit))
> library(VGAM)
> lines(x, fitted(fit))
Error in function (classes, fdef, mtable) :
unable to find an inherited method for function "fitted", for
signature "lm"
> library(flexmix)
> lines(x, fitted(fit))
I think this should be possible to solve by also adding
importFrom(stats, fitted) to the NAMESPACE of "VGAM".
Best,
Bettina
Michael Kubovy wrote:> Hi,
>
> I was going through the examples in smartpred. It seems there's an
> unstated dependency on the fitted() function in package flexmix.
>
> n = 20
> set.seed(86)
> x = sort(runif(n))
> y = sort(runif(n))
> library(splines)
> fit = lm(y ~ ns(x, df=5))
> plot(x, y)
> lines(x, fitted(fit)) # won't work w/o prior loading of the flexmix
> package.
> newx = seq(0, 1, len=n)
> points(newx, predict(fit, data.frame(x=newx)), type="b", col=2,
err=-1)
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