I was able to get this to work by setting up a drawing window like this before trying "0 255 0 dpoly p1":
_2 _3 2 3 dwin 'example' On Mon, May 22, 2023 at 4:09 PM Devon McCormick <[email protected]> wrote: > 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 for the book [2], but it might be out of date anyways.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 >> ---------------------------------------------------------------------- >> For information about J forums see http://www.jsoftware.com/forums.htm >> > > > -- > > Devon McCormick, CFA > > Quantitative Consultant > > -- Devon McCormick, CFA Quantitative Consultant ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
