issymm — Test for symmetric matrix


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

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