Evaluator

Robert Israel — Wed, 30 Jun 2010 06:15:49 Z

It appears to be NULL.

default value

jakubi — Wed, 30 Jun 2010 08:25:03 Z

This question was made in the context of acer's post, in whose example kernelopts(Evaluator) is bound to a procedure:

kernelopts(Evaluator=proc(x::uneval) x=eval(x); end proc):
kernelopts(Evaluator);

    kernelopts(Evaluator) = (proc(x::uneval) x = eval(x) end proc)

Clearly, NULL cannot be its default value:

restart;
kernelopts(Evaluator=NULL);
a:=1;

                                a :=

restart:#recovering default
a:=1;
                                a := 1

It sounds to me like the default value should be a procedure (or something that evaluates to that). Clearly, any disruption could be done by binding nonsense:

restart;
kernelopts(Evaluator=4);
a:=1;

                                a := 4
kernelopts(Evaluator);
                                  4

MaplePrimes - answers and comments on Question, Evaluator

Evaluator

default value