Smart programming saves computing times

June 21, 2008
By

(This article was first published on Yu-Sung Su's Blog, and kindly contributed to R-bloggers)

Recently, I tried to learn C language so that I can write a C addon for some R rountines to redress the speed issue in R. In my last post here, I have documented how a simple trick can speed up R. Nonetheless, I had an example which shows that smart programming can really save computing times.I was trying to calculate a distant matrix for the pairwise matching. That is, suppose I had vectors

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