Syntax Running without an output

[Emara]

Dear all.,

The attached syntax is running and running , but it gave no output or even errors.

Could you help me with this problem?

[Rick_SAS]

You have an infinite loop. There is no reason to expect the DO UNTIL loop to ever terminate.

In fact, if you let it run for 10,000 iterations, you get a plot that looks like the one I've attached. For these iterations |z| is usually in [-0.5, 0.5].

A good programming practice is to put a maximum number of iterations on the DO/UNTIL loop, like this:

   do rl = 1 to 10000 until(zz>h|zz<-h);

   ...

  end;

That way, you never have an infinite loop.