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<p>
The following topics are selected
from "Chapter 22" of <a href="http://www.insightful.com/" target="_blank">S-Plus</a> 2000 Programmer's Guide
(or my mirror <a href="./reference/pguide.pdf" target="_blank">here</a>).
Some of them are very useful to improve your code to make it short and more efficient.
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<font color="red">
<ul>
<li> Use Vectorized Arithmetic
<li> Avoid for Loops
<li> Avoid Growing Data Sets
<li> Avoid Looping Over Named Objects
<li> Keep It Simple!
<li> Reuse Computations
<li> Reuse Code
<li> Avoid Recursion
</ul>
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