The NumericEventHandler, sometimes it works, sometimes it does not.

[Peter Luschny]

restart;
ln(0);
tan(Pi/2);

#> Error, (in ln) numeric exception: division by zero
#> Error, (in tan) numeric exception: division by zero

# Now we replace the NumericEventHandler for division by zero.
NumericEventHandler(division_by_zero = proc(operator,operands,defVal) -infinity end):

ln(0);
tan(Pi/2);

#> -infinity
#> -infinity

# So far so good. Now define

restart;
gammaquot := (n, k) -> limit(GAMMA(n+1+x)/(GAMMA(k+1)*GAMMA(n-k+1+x)), x=0);
gammaquot(-1,-1);
#> Error, (in GAMMA) numeric exception: division by zero

restart;
NumericEventHandler(division_by_zero = proc(operator,operands,defVal) -infinity end):
gammaquot := (n, k) -> limit(GAMMA(n+1+x)/(GAMMA(k+1)*GAMMA(n-k+1+x)), x=0);
gammaquot(-1,-1);

#>0

# Q1: Why is the NumericEventHandler not used here?
# Q2: What is the correct value of gammaquot(-1,-1)?

[asetof...@gmail.com]

I don't know Maple language, but for me "exceptions handle" can not be used on all different of catch few 1 or 2 type of error(write out memory reserved and don't know other) error