* Raul,
I have been working on this example
(- ~:) &. q: 5040
1152
and have been able to unfold it to
q:^:_1 (q: 5040) - (~: q: 5040)
1152
resp
*/ (q: 5040) - (~: q: 5040)
1152
and all the time hadn't recognized (- ~:) as the hook it is ...
Thanks for pointing that out to me (again..?).
* Don,
I've never used that 'F2' trick as
I'm mostly doing stuff within jconsole (sometimes in jqt) -
I'd be interested to learn where (in what kind of environment) is
that hotkey to be used..?
* Roger,
I've successflully derived the more conventional product formula
*/(p-1)*p^e-1
and obviously need to do some more deriving :)
Thanks for the link to Andrew's post;
I also regard his expression as 'neat',
that's been the motivation to follow up on it ...
-M
At 2017-04-02 07:48, you wrote:
Are you asking about trains (hooks and forks)?
http://www.jsoftware.com/help/dictionary/dictf.htm
Thanks,
--
Raul
On Sun, Apr 2, 2017 at 3:39 AM, Martin Kreuzer <[email protected]> wrote:
> Hi all -
> In section 'Primes' of the Vocabul I found this line of code (at the very
> end, function no 5):
> (- ~:) &. q: y
> I do know that it is another way to calculate the totient of y, and
> I'm somehow familiar with the use of (~:) and (&.) and (q:), but
> have not yet found any documentation of this construct (- ~:)
> [btw, these seem to work too (+ ~:), (* ~:), (% ~:)]
> Where should I explore further..?
> -M
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