Re: [R] "no applicable method"

From: Petr PIKAL <petr.pikal_at_precheza.cz>
Date: Fri, 29 Jun 2007 11:10:34 +0200


Hi

>From help page

A data frame is a list of variables of the same length with unique row names, given class "data.frame".

so something completely different from matrix (which is AFAIK a vector with dimensions attribute). Therefore matrix needs to have all its values of the same type (numeric, character) but in data framwe you can mix columns with different types.

Regards

Petr Pikal
petr.pikal_at_precheza.cz

r-help-bounces_at_stat.math.ethz.ch napsal dne 28.06.2007 20:12:49:

> You actually got it right.
> I didn't realize there was a difference between a data frame and
> matrix. What is the difference any way? Seems like all two
> dimensional arrays should be equivalent.
>
> Kyle
>
>
>
> > On Wed, 27 Jun 2007, Kyle Ellrott wrote:
> >
> >> I'm getting started in R, and I'm trying to use one of the gradient
> >> boosting packages, mboost. I'm already installed the package with
> >> install.packages("mboost") and loaded it with library(mboost).
> >> My problem is that when I attempt to call glmboost, I get a message
> >> that " Error in glmboost() : no applicable method for "glmboost" ".
> >> Does anybody have an idea of what kind of problem this is
> >> indicative of?
> >
> > The wrong class of input object 'x'. The help page for glmboost is
> > written obscurely, but it seems to imply that it has methods for
> > 'formula' and 'matrix'.
> >
> > Perhaps you passed a data frame?
> >
> >> PLEASE do read the posting guide http://www.R-project.org/posting-
> >> guide.html
> >> and provide commented, minimal, self-contained, reproducible code.
> >
> > is pertinent. With an example and its output we would have been
> > much better placed to help you.
> >
> > --
> > Brian D. Ripley, ripley_at_stats.ox.ac.uk
> > Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
> > University of Oxford, Tel: +44 1865 272861 (self)
> > 1 South Parks Road, +44 1865 272866 (PA)
> > Oxford OX1 3TG, UK Fax: +44 1865 272595
>
> ______________________________________________
> R-help_at_stat.math.ethz.ch mailing list
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> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.



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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Fri 29 Jun 2007 - 09:15:36 GMT

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