[R] "no applicable method"

[Petr PIKAL]

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
> 
> ______________________________________________
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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.