[Jprogramming] Getting more than one value back from "From" or alternative approach

[Ric Sherlock]

Thanks Bob, I was trying to work out how to insert alternate spaces and
1j1#  is nicer than my solution. Here is a simplification of my earlier
idea:
   1j1&#"1 (e3 e."1 f)} (5 5$'.'),:'@'
. @ . . .
. @ @ . .
. @ . @ .
. @ . . .
. . . . @





On Tue, Dec 4, 2012 at 6:13 PM, bob therriault <bobtherriault at mac.com>wrote:

> Harvey,
>
> Is there a reason that you would not be able to add the spaces at the end
> using iji #  ?
>
>     e3=. 12 13 14 15 16 11 2 3 4 17 10 1 0 5 18 9 8 7 6 19 24 23 22 21 20
>    e3
> 12 13 14 15 16 11 2 3 4 17 10 1 0 5 18 9 8 7 6 19 24 23 22 21 20
>     sqdata=. 'X@@. at ..@.... at .......@….' NB. Spaces removed from character
> string
>    e=.5 5 $ e3 { sqdata
>    e
> @....
> . at .@.
> . at X..
> .. at ..
> ....@
>    1j1#"1 e
> @ . . . .
> . @ . @ .
> . @ X . .
> . . @ . .
> . . . . @
>
> Cheers, bob
>
> On 2012-12-03, at 6:21 PM, PackRat wrote:
>
> > I have an application where I have a numeric evolute that I want to
> > visualize.  Essentially, I have a list of values within the evolute
> > that I want to display as a given literal character, while the
> > remaining values would be a default "background" literal character.
> >
> > Everything works fine until I get to a point where I need to select
> > values in such a way that I retrieve not only the "anchor" (selected)
> > value from a list of ordered display characters but also one or more
> > (depending on how the ordered list is constructed) succeeding
> > separating characters.  "From" seems to be the kind of thing I'd like
> > to do, but that returns only a single value for each element of the
> > lefthand argument.  In other words, I know that you can do something
> > like:
> >
> >        0 4 10 18 { array
> >
> > which will return FOUR elements from "array".  However, since in my
> > case, each of the elements in "array" is followed (separated) by a
> > space character, what I *want* returned are four PAIRS of characters
> > (the element and its succeeding space): 0-1, 4-5, 10-11, and 18-19.
> >
> > Is there some way to make "From" be able to do this, or can someone
> > suggest another approach?  I'm stuck at the moment.  Here's a sample
> > evolute of size 5:
> >
> >   13 14 15 16 17
> >   12  3  4  5 18
> >   11  2  1  6 19
> >   10  9  8  7 20
> >   25 24 23 22 21
> >
> > For this example's sake, I decided to "mark" the Fibonacci series
> > (contained in a list):
> >
> >   f=. 1 2 3 5 8 13 21
> >
> > After the earlier half of the program does its thing (correctly), the
> > next lines would be (e3 has 25 values):
> >
> >   e3=. 12 13 14 15 16 11 2 3 4 17 10 1 0 5 18 9 8 7 6 19 24 23 22 21
> > 20
> >
> >   sqdata=. 'X @ @ . @ . . @ . . . . @ . . . . . . . @ . . . . '
> >
> >   e4=. (2 * e3) { sqdata    NB. this is the problem area
> >
> >   e=. (2*5 , 5) $ e4
> >
> > The end result (e) should look like this:
> >
> >   @ . . . .
> >   . @ . @ .
> >   . @ X . .
> >   . . @ . .
> >   . . . . @
> >
> > The reason I need the spacing characters is because a square doesn't
> > look square on a screen or printer since characters are rectangular in
> > shape (not square).  Looking square is important for my application.
> >
> > Thanks in advance for any help solving this!
> >
> >
> > Harvey
> >
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