dot — Vector dot product


\begin{rail} Dot : 'dot' '(' Matrix ',' Matrix ')' ; \end{rail}
dot() calculates the dot product of two argument vectors. The vectors should have the same number of elements. The resultant is a scalar consisting of the sum of the element by element product of the two vectors. $\Longrightarrow$ This is not an built-in function. This function is normally loaded on start-up from the dot.r file in the standard rlib directory. Use of the -r option, incorrectly setting the RLAB_LIB_DIR environmental variable, or modifying dot.r may make this function unavailable.
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