Try the lab Lab: Viewmat To advance the lab, press Esc A in JHS or Ctrl-J in Gtk.
── (1 of 20) Overview ─────────────────────────────────────── The viewmat utilities display tables of data graphically. They are used in several of the labs. There are three utilities: viewmat - view arbitrary table viewrgb - view table of RGB integers viewbmp - view bitmap file viewmat is the main utility, and is used by the other verbs. This lab displays several viewmat windows. You can leave them open and move them aside to view the lab text. To close them, press Esc in the viewmat window. 2011/11/7 David Vaughan <[email protected]> > Am I right in thinking that viewmat takes a 2d array and treats it as if > each number is a pixel and its value is its colour? > Thanks. > > ___________________________ > > David Vaughan > > On 6 Nov 2011, at 20:12, "Linda Alvord" <[email protected]> wrote: > > > Here's another option: > > > > S=: 13 :'''+.''{~([:+./*.)"1/~#:i.y' > > S > > '+.' {~ [: ([: +./ *.)"1/~ [: #: i. > > > > S 8 > > ++++++++ > > +.+.+.+. > > ++..++.. > > +...+... > > ++++.... > > +.+..... > > ++...... > > +....... > > > > Linda > > > > > > > > > > > > > > > > > > > > -----Original Message----- > > From: [email protected] > > [mailto:[email protected]] On Behalf Of Roger Hui > > Sent: Saturday, November 05, 2011 2:10 PM > > To: Programming forum > > Subject: Re: [Jprogramming] Binary Addresses Method > > > > I believe the "and" in your pseudocode maps to 17 b. (bitwise and). > Thus: > > 0 = 17 b./~ i.256 > > > > For example, using the boolean matrix result to index into '.*', > > > > '.*' {~ 0 = 17 b./~ i.16 > > **************** > > *.*.*.*.*.*.*.*. > > **..**..**..**.. > > *...*...*...*... > > ****....****.... > > *.*.....*.*..... > > **......**...... > > *.......*....... > > ********........ > > *.*.*.*......... > > **..**.......... > > *...*........... > > ****............ > > *.*............. > > **.............. > > *............... > > > > > > > > On Sat, Nov 5, 2011 at 10:50 AM, mikel paternain > > <[email protected]>wrote: > > > >> > >> > >> > >> In the amazing book Chaos and Fractals New frontiers of Science, the > >> authors described a simple algorithm for making the Sierpinski Gasket. > > This > >> is perhaps the most short and efficient algorithm (in non tacit > > programming > >> languages) for computing this fractal. > >> The basic algorithm is(in pseudocode): > >> > >> Define x,y > >> For y=0 to 255 > >> For x=0 to 255 > >> If /x And y)=0 Then Pset(x,y) //Pset is a function for drawing > >> the point x,y > >> Next x > >> Next y > >> End > >> > >> With my little experience inJ the question is how translate this code > to J > >> . Help me please! > >> Thanks in advance!! > >> > >> Mikel > >> ---------------------------------------------------------------------- > >> 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 > -- Björn Helgason, Verkfræðingur Fornustekkum II 781 Hornafirði, t-póst: [email protected] gsm: +3546985532 twitter: @flugfiskur http://groups.google.com/group/J-Programming Tæknikunnátta höndlar hið flókna, sköpunargáfa er meistari einfaldleikans góður kennari getur stigið á tær án þess að glansinn fari af skónum /|_ .-----------------------------------. ,' .\ / | Með léttri lund verður | ,--' _,' | Dagurinn í dag | / / | Enn betri en gærdagurinn | ( -. | `-----------------------------------' | ) | (\_ _/) (`-. '--.) (='.'=) ♖♘♗♕♔♙ `. )----' (")_(") ☃☠ ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
