Re: [R] classes and functions for qqnorm and stem

2010-04-15 Thread Peter Ehlers
On 2010-04-14 21:20, Uwe Dippel wrote: Referring to "Using R for Data Analysis and Graphics" by J H Maindonald, and available from the R site, I found the example on p.30 non-working: > stem(qqnorm(possum$hdlngth)) Error in stem(qqnorm(possum$hdlngth)) : 'x' must be numeric Since qqnorm(possum$h

[R] classes and functions for qqnorm and stem

2010-04-14 Thread Uwe Dippel
Referring to "Using R for Data Analysis and Graphics" by J H Maindonald, and available from the R site, I found the example on p.30 non-working: > stem(qqnorm(possum$hdlngth)) Error in stem(qqnorm(possum$hdlngth)) : 'x' must be numeric Since qqnorm(possum$hdlngth) plots, and > class(possum$hdlngt