isempty — Test for zero length matrix


\begin{rail} Isempty : 'isempty' '(' Matrix ')' ; \end{rail}
isempty returns 1 if the argument matrix is not empty. Otherwise it returns 0. $\Longrightarrow$ This is not an built-in function. This function is normally loaded on start-up from the isempty.r file in the standard rlib directory. Use of the -r option, incorrectly setting the RLAB_LIB_DIR environmental variable, or modifying isempty.r may make this function unavailable.
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