[R] Efficiency: whole vector and for loop methods

[Torsten Hothorn]

>
> Based on your particular problem, you can test the efficiency of any
> method you can think of with the system.time() function.

or, much more informative, by profiling via `Rprof()' !

Torsten

> I find it
> difficult to give a better advice considering the little information you
> provided about your problem.
>
> If that doesn't help, perhaps you could send a simple and reproducable
> example of what you want to do.
>
> Jerome
>
> On April 2, 2003 09:41 am, graham lawrence wrote:
> > Content-Length: 535
> > Status: R
> > X-Status: N
> >
> >
> > Dear R-help,
> >
> > As a generalization, is it more efficient to use a single method to
> > selectively transform items in a matrix?  Preferably whole-vector, yes;
> > but if one of the column vectors compels the use of a "for loop", is it
> > then faster to do all of the transformations for the matrix via that
> > "for loop", rather than use a mixture of methods on a column-wise basis?
> >
> > TIA
> >
> > graham lawrence
> >
> > ______________________________________________
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>
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