[R] Efficiency: whole vector and for loop methods

Jerome Asselin jerome at hivnet.ubc.ca
Thu Apr 3 02:47:15 CEST 2003

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


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?
> graham lawrence
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