1. 23
  1.  

  2. 2

    If you liked that, you may want to read J for C programmers online. I’ve purchased my PDF copy from Lulu.

    1. 1

      I really wanted this to be from Ordinary differential equations to J but this is also ok

      1. 2

        After reading this I couldn’t resist solving the harmonic oscillator numerically in q…
        (last line is just ASCII plotting)

        q)a:2 2#1 0 0 1+0.01*0 1 -1 0
        q)z:2000(a$)\1.0 0
        q)" *"[(3-til 7)=\:"j"$3*z[25*til 50;0]]
        "***                    *****                    **"
        "   **                **     **                **  "
        "     *              *         *              *    "
        "      *            *           **           *     "
        "       **        **              *         *      "
        "         **     *                 **     **       "
        "           *****                    *****         "
        
        1. 1

          No, this is ok. ;)

          EDIT: actually, do you have a link to From Ordinary Differential Equations to J?

          1. 2

            From Ordinary Differential Equations to J

            Unfortunately I haven’t found this yet. Might have to learn me some APL and write it myself.

            1. 4

              Oh. I get it. “Ode” as an acronym. In my defense I hadn’t had any coffee yet.

              If you’re interested in that sort of thing, you might like this: http://www.softwarepreservation.org/projects/apl/Books/CollegeMathematicswithAPL/view