R help - Sep 2003 - factor creation

Another newbie question....
  I want to create a factor (say cT)from a numerical variable (sy temp) by 
regrouping the values in classes (say cT <390,
[390,400[,[400,409[...>=550)

Is there a simple way of doing that using the factor function?

AND I do not find how to manipulate strings (I want to concatenete characters 
strings ("abkdas","chjw") into something like
("abkdas;chjw")what operators are
available for strings manipulation and where do I find help??

Thanks a lot to you all

Anne 

Anne Piotet
av Jomini 1
1004 lausanne

t?l: +41 21 646 41 32

On Fri, 12 Sep 2003 anne.piotet at urbanet.ch wrote:
> Another newbie question....
>   I want to create a factor (say cT)from a numerical variable (sy temp) by 
> regrouping the values in classes (say cT <390,
[390,400[,[400,409[...>=550)
> 
> Is there a simple way of doing that using the factor function?
No, but see ?cut.
> AND I do not find how to manipulate strings (I want to concatenete
characters
> strings ("abkdas","chjw") into something like
("abkdas;chjw")what operators are
> available for strings manipulation and where do I find help??
See ?paste.  This is in `An Introduction to R', and all good books on S/R
will give you more details.

-- 
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

anne.piotet at urbanet.ch wrote:
> I do not find how to manipulate strings (I want to concatenete characters 
> strings ("abkdas","chjw") into something like
("abkdas;chjw")what operators are
> available for strings manipulation and where do I find help??
Use the paste operator with specification of separator :

e.g. paste("abkdas","chjw",sep=";") will return
string "abkdas;chjw"

Laurent

In a message dated 9/12/03 1:16:51 AM Pacific Daylight Time, 
ripley@stats.ox.ac.uk writes:
> On Fri, 12 Sep 2003 anne.piotet@urbanet.ch wrote:
> 
> >Another newbie question....
> >  I want to create a factor (say cT)from a numerical variable (sy temp)
by
> >regrouping the values in classes (say cT <390,
[390,400[,[400,409[...>=550)
> >
> >Is there a simple way of doing that using the factor function?
> 
> No, but see ?cut.
Also see, cut2 in "design" library.  There are other useful functions
for
data manipulation and management. Documentation can be found at:
<A
HREF="http://hesweb1.med.virginia.edu/biostat/s/Design.html">http://hesweb1.med.virginia.edu/biostat/s/Design.html</A>


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