Trying to reproduce this error, I get a different error at the same step
(for version 9.4.22 on Windows 10 running JQt):
|value error: SC
| Y=.x:^:_1 SC 2{."1 y
I will look into this and report what I find.
On Mon, May 22, 2023 at 4:03 PM Nils Reuße <[email protected]> wrote:
> Hi all,
>
> I bought Part 1 of Cliff Reiters book "Fractals, Visualization and J,
> Fourth edition“ and am trying out the introduction examples.
>
> It first tells me to load an add-on, dwin.ijs [1], and then to create a
> window, which works:
>
> load '~addons/graphics/fvj4/dwin.ijs'
> _1 _1 1 1 dwin 'hello'
>
> Now, some data is created in p1:
>
> ]p1=: |:2 1 o./ 1r4p1*i.5
> 1 0
> 0.707107 0.707107
> 6.12323e_17 1
> _0.707107 0.707107
> _1 1.22465e_16
>
> And finally, the data is supposed to be drawn with ‚dpoly‘, which fails:
>
> 0 255 0 dpoly p1
>
> |psel : command failed: psel
> : wd
> | (LF,~wd ::(''"_)'qer') (13!:8)3
>
>
> The book states that the examples were tested with J8.04, I’m on
> J9.4.2/j64arm/darwin. There is an official repository containing the code
> for the book [2], but it might be out of date anyways.
>
> Is the code incompatible with J9.4 or am I doing something wrong?
>
> - Nils
>
>
> [1] https://github.com/jsoftware/graphics_fvj4/blob/master/dwin.ijs
> [2] https://github.com/jsoftware/graphics_fvj4
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>
--
Devon McCormick, CFA
Quantitative Consultant
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