Or you might want to abandon the clumsy "if...then...else" paradigm and do
it in an array fashion:
(3 : '(''too cold'';''OK'';''too hot'')#~y=/:~y,30,90')"0 ] 10 20 39 30
31 89 90 91
+--------+-------+
|too cold| |
+--------+-------+
|too cold| |
+--------+-------+
|OK | |
+--------+-------+
|too cold|OK |
+--------+-------+
|OK | |
+--------+-------+
|OK | |
+--------+-------+
|OK |too hot|
+--------+-------+
|too hot | |
+--------+-------+
This highlights the ambiguous cases where y is equal to the break-points.
Not only that, but the array solution gives us a hint as to how we might
generalize this further by supplying the break-points as our left argument:
(30 90) (4 : '(''too cold'';''OK'';''too hot'')#~y=/:~y,x')"_ 0 ] 10 20
39 30 31 89 90 91
+--------+-------+
|too cold| |
+--------+-------+
|too cold| |
+--------+-------+
|OK | |
+--------+-------+
|too cold|OK |
+--------+-------+
|OK | |
+--------+-------+
|OK | |
+--------+-------+
|OK |too hot|
+--------+-------+
|too hot | |
+--------+-------+
The next most obvious step after this is to extend the left argument to
include both the ('too cold';'OK';'too hot') labels with the breakpoints as
the left argument.
On Sun, Jun 28, 2015 at 2:02 AM, 'Bo Jacoby' via Programming <
[email protected]> wrote:
> Highlight the corrected program definition and type ctrl-E to execute the
> highlighted text.
>
>
> Den 5:51 søndag den 28. juni 2015 skrev Raul Miller <
> [email protected]>:
>
>
>
> Oh, yes - my control-N comment assumed he was using jqt. If he was
> using JHS it's different.
>
> Thanks,
>
> --
> Raul
>
>
> On Sat, Jun 27, 2015 at 11:28 PM, Joe Bogner <[email protected]> wrote:
> > For throwaway definitions, the JHS (web-based ide) scratch window is good
> > too.
> > On Jun 27, 2015 11:20 PM, "Raul Miller" <[email protected]> wrote:
> >
> >> For multi-line definitions like this, you should be putting your
> >> script in a file.
> >>
> >> Hit control-N to get a blank editor window.
> >>
> >> Thanks,
> >>
> >> --
> >> Raul
> >>
> >>
> >> On Sat, Jun 27, 2015 at 10:24 PM, Daniel Roe <[email protected]> wrote:
> >> > I'm just learning J so this is a bit of a newbie question.
> >> > 1) I open up the J session window
> >> > 2) I type in a definition of a verb from the Learning J document -
> >> Chapter 12...
> >> >
> >> > dog =: 3 : 0
> >> > if. y>90 do. 'too hot'
> >> > elseif. y<30 do. 'too cold'
> >> > elseif. 1 do. 'OK'
> >> > end.
> >> > )
> >> > It's the porridge - too hot - too cold - example - I called it dog
> >> > Now I want to go back in and change the parameters a bit - for
> example I
> >> want to make too cold be < 40 not 30.3) I put the cursor in the
> definition
> >> and change the 30 to a 40
> >> >
> >> > 4) With the cursor I select the entire definition and then copy it
> with
> >> a CTRL-C
> >> >
> >> > 5) I hit he enter key until I get the waiting for input cursor down
> >> below everything
> >> > 6) I paste in the modified definition with a CTRL-V and hit enter
> >> > 7) I get a syntax error message.
> >> > I can't believe that one must re-type the entire definition just to
> make
> >> a change. What am I doing wrong?
> >> > Dan
> >> >
> >> >
> >> > ----------------------------------------------------------------------
> >> > 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
> ----------------------------------------------------------------------
> For information about J forums see http://www.jsoftware.com/forums.htm
>
>
>
>
> ----------------------------------------------------------------------
> For information about J forums see http://www.jsoftware.com/forums.htm
>
--
Devon McCormick, CFA
----------------------------------------------------------------------
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