R help - Apr 2005 - Error in colMeans ... what's wrong with my data?

Having searched and searched I still haven't found what's the problem
with my data (I've attached the relevant file).
Every time I tried to use the CANCOR-Function I got error messages.
So I turned to check my two sets of variables separately by using the
"colMeans"-Function. With one set no problem .. but with the other.

My input :
> struktur <- read.delim("struktur.csv", header=TRUE, sep =
";")
>colMeans(struktur)
And the resulting error:

Error in colMeans(x, n, prod(dn), na.rm) : 
        `x' must be numeric


Can anyone give me a hint concerning the mistake I made?


Many thanks in advance

hardy

-- 
Hartmut Weinrebe
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Akaflieg - hardy at akaflieg.uni-karlsruhe.de
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On Fri, 2005-04-01 at 20:27 +0200, Hartmut Weinrebe
wrote:
> Having searched and searched I still haven't found what's the
problem with my data (I've attached the relevant file).
> Every time I tried to use the CANCOR-Function I got error messages.
> So I turned to check my two sets of variables separately by using the
"colMeans"-Function. With one set no problem .. but with the other.
> 
> My input :
> 
> > struktur <- read.delim("struktur.csv", header=TRUE, sep =
";")
> >colMeans(struktur)
> 
> And the resulting error:
> 
> Error in colMeans(x, n, prod(dn), na.rm) : 
>         `x' must be numeric
> 
Check what str(stuktur) gives you... looks like it seeing your numbers
as something else..

BTW, I do not to have the attached file, seems to have been dropped
before reaching my inbox, so that's all I can suggest.

F
-- 
Federico C. F. Calboli
Department of Epidemiology and Public Health
Imperial College, St Mary's Campus
Norfolk Place, London W2 1PG

Tel  +44 (0)20 7594 1602     Fax (+44) 020 7594 3193

f.calboli [.a.t] imperial.ac.uk
f.calboli [.a.t] gmail.com

On Fri, 1 Apr 2005, Hartmut Weinrebe wrote:
> Having searched and searched I still haven't found what's the
problem with my data (I've attached the relevant file).
> Every time I tried to use the CANCOR-Function I got error messages.
> So I turned to check my two sets of variables separately by using the
"colMeans"-Function. With one set no problem .. but with the other.
>
> My input :
>
>> struktur <- read.delim("struktur.csv", header=TRUE, sep =
";")
>> colMeans(struktur)
>
> And the resulting error:
>
> Error in colMeans(x, n, prod(dn), na.rm) :
>        `x' must be numeric
>
>
> Can anyone give me a hint concerning the mistake I made?
You applied colMeans to a data frame: the help page says

        x: an array of two or more dimensions, containing numeric,
           complex, integer or logical values, or a numeric data frame.

One or more columns of `struktur' are not numeric.  (Note that whereas an 
array can be logical, a data frame must be wholly numeric.)

-- 
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