_8^%3
Den 20:37 mandag den 31. juli 2017 skrev Skip Cave
<[email protected]>:
1 j. %:3 NB. I Should have looked at the bottom part of the dictionary
closer!
Roger said: " j. plays the same role for complex numbers as - for integers
and % for rational numbers.
"
Hmmm... "% for rational numbers" What does that mean? Let's see...
%2r3
3r2
%123456r78901
78901r123456 NB. Cool! I didn't know that!
Skip
Skip Cave
Cave Consulting LLC
On Mon, Jul 31, 2017 at 1:22 PM, Roger Hui <[email protected]>
wrote:
> Ken Iverson invented j. and IMO is a masterstroke which separates him from
> mere mortals. j. plays the same role for complex numbers as - for integers
> and % for rational numbers.
>
> See section 8 of *Some Exercises in APL Language Design
> <http://www.jsoftware.com/papers/APLDesignExercises.htm>*.
>
>
>
>
> On Mon, Jul 31, 2017 at 11:13 AM, Kenneth Lettow <[email protected]>
> wrote:
>
> > 1 j. %:3
> >
> > On Mon, Jul 31, 2017 at 2:10 PM, Skip Cave <[email protected]>
> > wrote:
> >
> > > How can I create the complex number 1 i (sqrt 3) in J
> > >
> > > Several tries didn't work:
> > >
> > >
> > >
> > > 1j%:3
> > >
> > > |ill-formed number
> > >
> > > a =: %:3
> > >
> > > 1ja
> > >
> > > |ill-formed number
> > >
> > > 1j(%:3)
> > >
> > > |ill-formed number
> > >
> > > %:3
> > >
> > > 1.73205
> > >
> > > 1j1.73205
> > >
> > > 1j1.73205 NB. This works, but it isn't very elegant.
> > >
> > > NB. I have to copy/paste the square root as text.
> > >
> > >
> > >
> > >
> > > Skip Cave
> > > ----------------------------------------------------------------------
> > > For information about J forums see http://www.jsoftware.com/forums.htm
> > ----------------------------------------------------------------------
> > For information about J forums see http://www.jsoftware.com/forums.htm
> >
> ----------------------------------------------------------------------
> For information about J forums see http://www.jsoftware.com/forums.htm
>
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