Maxima Function
errcatch (expr_1, ..., expr_n)
Evaluates expr_1, ..., expr_n one by one and
returns [expr_n] (a list) if no error occurs. If an
error occurs in the evaluation of any argument, errcatch
prevents the error from propagating and
returns the empty list [] without evaluating any more arguments.
errcatch
is useful in batch files where one suspects an error might occur which
would terminate the batch if the error weren't caught.