[R] Histogram

Mulholland, Tom
Thu, 21 Apr 2005 01:56:45 -0000

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!
>
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