Thanks @Vijay. Don't apologize -- I'm a nit-picky sort of person. IMO typos in jwiki code are important: Mars missions have been lost for less.
FYI... the "book chapters" linked from http://www.jsoftware.com/jwiki/At%20Play%20With%20J came out of a volunteer effort by the J community to revise and update to j6.02 the late Eugene McDonnell's celebrated series of articles in Vector (the journal of the British APL Association) published between 1992 and 2006. These jwiki pages served as input to the ms from which the Lulu.com paperback book was printed. I gave the ms a final polish before publication, adding footnotes, but alas did not rigorously retrofit every error I discovered back into the jwiki. In summary: ++ jwiki pages -- free, but offered without warranty. Fixable. ++ paperback -- from Lulu.com. Not free. Not fixable, but quality-assured by the publisher: Undead Tree Publications. Sold in aid of charity, list price $27.02 - less 15% saving. See publisher's website for details: www.undeadtree.com On Wed, Jan 7, 2015 at 5:31 PM, Vijay Lulla <[email protected]> wrote: > The "To Summarize" chapter was great. However, I spotted a couple of typos. > 1. The variable for storing 1000 digits is named g1000 whereas others are > named q30, q100, q1000, and q3000. > 2. You mention the consecutive digits formula correctly in the mail but > it's wrong on the page. There's no d1000 defined on the page. > > Sorry for being nitpicky. > > On Wed, Jan 7, 2015 at 12:28 AM, Ian Clark <[email protected]> wrote: > >> Vital reading is chapter 17 of "At Play With J", by Eugene McDonnell >> http://www.jsoftware.com/jwiki/At%20Play%20With%20J >> >> Here's my resultant page of notes made back in 2010. Touches on the >> points in this thread: >> >> See: Contact, by Carl Sagan, for a novel pivoting heavily on finding >> patterns in pi. >> >> Piphilology comprises the creation and use of mnemonic techniques to >> remember a span of digits of the mathematical constant π. The word is >> a play on Pi itself and the linguistic field of philology. >> >> The Indiana Pi Bill, an 1897 attempt by the Indiana state legislature >> to dictate a solution to the unending decimal problem by legislative >> fiat. >> >> Pi search... >> http://www.angio.net/pi/piquery >> http://en.wikipedia.org/wiki/String_searching_algorithm >> Probability of finding strings in pi http://www.angio.net/pi/whynotpi.html >> >> Should the search for meaningful sequences in pi be called perimancy? >> >> The Feynman Point: APWJ p136 >> http://www.jsoftware.com/jwiki/Doc/Articles/Play151 >> >> From end of Eugene McDonnell's article: >> "Before we part, let’s look at a consecutive portion of these digits: >> (762+i.6){q1000 >> 999999 >> Hmmm. Well, yes, that’s not too unusual.* In fact, if such strings >> didn’t occur every now and then, it would argue against randomness." >> >> FOOTNOTE: * Eugene has selected the so-called Feynman Point, a >> six-digit sequence 999999 in the decimal expansion of π to which >> Richard Feynman (1918-1988) used to draw attention in his lectures to >> make an instructive joke about what is and what is not perceived as >> random. (Ed.) >> ---------------------------------------------------------------------- >> 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
