The minimal bug case, so far I found, is:
load'plot'
pd'penstyle 1'
pd 0 1
pd 'show'
I tracked down the problem and figured out its source:
(<12 6)linepattern_jzplot_ 10 10 40 40
0 0 10 10
22 22 28 28
40 40 0 0
(<12 6)linepattern_jzplot_ 10 10 25 25 40 40
10 10 20 20
25 25 40 40
As you see when there are three points, it works okay, but when there
are two points, you get garbage 0 0 at the starting point and the
ending point.
It is because of erroneous use of append(,) in linepattern.
If you change the linepattern code in jzplot.ijs as following:
linepattern=: 4 : 0
nap=. ,`...@.('' -: ])`...@.('' -: [) NB. null appendable without effect
x=. > x
y=. _2 [\ y
if. x -: 1 0 do.
<. 2 ,\ y
else.
a=. ; 2 < @ (x&linepattern1) \ }: y
<. _2 ,\ a nap x linepattern2 _2 {. y NB. changed the simple
append into nap
end.
)
It works without any problem:
(<12 6)linepattern_jzplot_ 10 10 40 40
10 10 22 22
28 28 40 40
Of course, the graph draws perfectly with this modification.
If there are cleaner modification, of which existence I am sure, I'd
be happy to hear. Also I wish this bug is removed in the later
release.
Thank you.
On Tue, Apr 21, 2009 at 11:15 PM, June Kim <[email protected]> wrote:
> I suppose your post meant to be a reply to my another recent posting
> "Bug in penstyle?".
>
> Strangely, the following modification works, as you revealed.
>
> pd 'reset'
> pd 'penstyle 1'
> pd 0 500 1000;0 500 1000
> pd 'show'
>
> I think I had found a bug case with two points(say, 0 1;0 1) with penstyle 1.
>
> On Tue, Apr 21, 2009 at 8:48 PM, Brian Schott <[email protected]> wrote:
>> I got a slightly better result by plotting this slightly more complicated
>> graph.
>>
>> pd 'reset'
>> pd 'penstyle 1'
>> pd 0 500 1000;0 250 1000
>> pd 'show'
>>
>>
>>
>> --
>> (B=) <-----my sig
>> Brian Schott
>> ----------------------------------------------------------------------
>> 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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