[Rd] dim "heritage"
Prof Brian D Ripley
Sun, 1 Apr 2001 19:50:11 +0100 (BST)
On Sun, 1 Apr 2001, Erich Neuwirth wrote:
> i understand that part.
> i wonder if it would make sense
> thnat sort(x) also keeps the dimensions
> (it should be an object of the same dimensions in any case i can
Not so: it sorts as a vector, ignoring the multidimensional stucture.
Also, consider na.last = NA?
In any case, sort is not group Math and so not implemented by a group
generic function. One needs to know about such things to predict
the fine details like this.
> Prof Brian Ripley wrote:
> > On Sun, 1 Apr 2001, Erich Neuwirth wrote:
> > > when i do
> > >
> > > x<-4:1
> > > dim(x)<-c(4,1)
> > >
> > > and then
> > > z<-sin(x)
> > > dim(z) is c(4,1)
> > >
> > > sort(x)
> > > however, does not have a dim attribute.
> > >
> > > is this intended behavior?
> > Yes. You would expect x^2 to act elementwise, and all elementwise
> > arithmetic operations keep the dimensions.
> > --
> > Brian D. Ripley, email@example.com
> > 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 272860 (secr)
> > Oxford OX1 3TG, UK Fax: +44 1865 272595
> Erich Neuwirth, Computer Supported Didactics Working Group
> Visit our SunSITE at http://sunsite.univie.ac.at
> Phone: +43-1-4277-38624 Fax: +43-1-4277-9386
Brian D. Ripley, firstname.lastname@example.org
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 272860 (secr)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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