[R] Efficiency: whole vector and for loop methods

graham lawrence forporphyry at hotmail.com
Wed Apr 2 19:41:33 CEST 2003

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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