Efficiency: whole vector and for loop methods
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. 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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