Hello Donna; It looks like a letter from "exponential," like "r"atio, but "e" was taken.
------------------------------------------------------------------------ |\/| Randy A MacDonald | APL: If you can say it, it's done.. (ram) |/\| [EMAIL PROTECTED] | |\ | |If you cannot describe what you are doing BSc(Math) UNBF'83 þas a process, you don't know what you're doing. Sapere Aude | - W. E. Deming Natural Born APL'er | Demo website: http://156.34.87.165/ -----------------------------------------------------(INTP)----{ gnat }- ----- Original Message ----- From: "dly" <[EMAIL PROTECTED]> To: "General forum" <[email protected]> Sent: Wednesday, June 14, 2006 9:26 AM Subject: Re: [Jgeneral] Mathematical Roots of J > first impressions on trying to introduce my self t J (after 30 or so > years of APL) > > I am making my way through the Lab mathematical roots of J > > I am dyslexic and my math is rusty > > I get imaginary numbers 3j4 but at a loss why 1x1 for e > I see 1r1 but where did this x come from? it doesn't say but it > somehow seems to follow that 1p1 is PI > > I should be getting a general picture but I think there should be an > easier way to be led down the garden path > Donna > [EMAIL PROTECTED] > > > > On 14-Jun-06, at 8:15 AM, John Randall wrote: > > > Chris Burke wrote: > >> I don't think Mathematica had any influence on J, though perhaps > >> APL had > >> a minor influence on Mathematica. > > > > Mathematica was directly inspired by APL in certain operations, > > notably > > Map, Apply, Scan and Fold. Early versions of the Mathematica > > documentation contained a lot of references to APL: these have > > decreased > > over time. > > > > Much of the symbolic programming in Mathematica comes from Macsyma, in > > particular the ideas of many different types for mathematical > > expressions > > assembled in a directed acyclic graph; the functional programming > > idea of > > remembering the result of every functional evaluation; and a knowledge > > base of rules and heuristics for simplification of expressions. These > > types of operations have no equivalent in APL or J, and there has been > > little cross-pollination. > > > > Mathematica (like everyone else) relies on LAPACK and other Fortran > > libraries for hard-core numerical calculations. > > > > Best wishes, > > > > John > > > > > > ---------------------------------------------------------------------- > > 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
