[R] Histogram

Mulholland, Tom
Thu, 21 Apr 2005 03:31:37 -0000

Mea Culpa

I did copy and paste your code to make sure it was an error. I'll go and do
it again before I reply.

It worked as you expected it to. So I located where I had done it and this is
what I found

> f <- factor(sample(c("A", "B"), 50, replace=TRUE))
> hist(f)
Error in hist.default(f) : 'x' must be numeric

Since I had more than one session open I had inadvertantly pasted the

> hist.factor <- function(x, ...) barplot(table(x), ...)
into another window. For some reason or other I have always had finger trouble
with the "paste commands only" in the windows GUI, so I do it one line
at a time or past into Tinn-R and select with the alt key.

I guess its time for me to actually understand methods, because it's
patently obvious I don't even though I was beginning to think I had a handle
on them.

Tom
> -----Original Message-----
> From: Liaw, Andy [mailto:andy_liaw at merck.com]
> Sent: Thursday, 21 April 2005 10:06 AM
> To: Mulholland, Tom
> Subject: RE: [R] Histogram
>
>
> Have you tried it?  hist.factor() as defined would be the
> hist method for
> the factor class, so hist(f) would work if f is a factor.
>
> Andy
>
> > From: Mulholland, Tom
> >
> > Of course Andy meant hist.factor(f)
> >
> > In particular you should note that Andy uses the table
> > function to "transform ... the data from characters to
numbers"
> >
> > Tom
> >
> > > -----Original Message-----
> > > From: r-help-bounces at stat.math.ethz.ch
> > > [mailto:r-help-bounces at stat.math.ethz.ch]On Behalf Of Liaw,
Andy
> > > Sent: Thursday, 21 April 2005 12:14 AM
> > > To: 'ferri.leberl at gmx.at'; r-help at stat.math.ethz.ch
> > > Subject: RE: [R] Histogram
> > >
> > >
> > > > From: Mag. Ferri Leberl
> > > >
> > > > Dear everybody!
> > > > I am analysing data from an enquette. The answers are either
> > > > A or B. How can I
> > > > draw a histogram without transforming the data from
> > > > characters to numbers? If
> > > > the data are saved in a list M, hist(M[,1]) returns:
> > > >
> > > > Error in hist.default(M[, 1]) : `x' must be numeric
> > > > Execution halted
> > >
> > > You can try:
> > >
> > > > hist.factor <- function(x, ...) barplot(table(x), ...)
> > > > f <- factor(sample(c("A", "B"), 50,
replace=TRUE))
> > > > hist(f)
> > >
> > > HTH,
> > > Andy
> > >
> > > > Thank you in advance!
> > >
> > > ______________________________________________
> > > R-help at stat.math.ethz.ch mailing list
> > > https://stat.ethz.ch/mailman/listinfo/r-help
> > > PLEASE do read the posting guide!
> > > http://www.R-project.org/posting-guide.html
> > >
> >
> >
> >
>
>
>
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