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
[EMAIL PROTECTED]
[EMAIL PROTECTED] 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, [EMAIL PROTECTED]
> > 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.
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