Jose, I went back to look at your code and I think the result for 1 0 1 should be:
0j1 0j_1 I was still thinking about getting "not quadratic" in the single line. Linda -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Jose Mario Quintana Sent: Monday, November 9, 2015 12:35 PM To: Programming forum Subject: Re: [Jprogramming] Quadratic formula Tacitly... (A=. 0&{) (B=. 1&{) (C=. 2&{) 0&{ 1&{ 2&{ qr=. (-@:B + (+ , -) @:%:@:(*:@:B - 4 * A * C)) % 2 * A quad=. qr`('Not quadratic'"_)@.(0 -: A) f. quad 2 _8 6 3 1 quad 0 _8 6 Not quadratic On Mon, Nov 9, 2015 at 2:26 AM, Don Kelly <[email protected]> wrote: > If you assume the form is ax^2 +bx +c =0 then all you have to do is > check for a=0 0=0{ a b c is true so not quadratic and flag it if > true > > Don Kelly > > > On 11/6/2015 3:18 PM, Kip Murray wrote: > >> Most of us have heard of the quadratic formula >> >> x = ( -b +or- %: (b^2 - 4ac) )/2a (roughly standard math notation) >> >> for solving ax^2 + bx + c = 0 for x . >> >> Your mission, should you decide to accept it, is to write a verb quad >> that takes >> vector a,b,c as argument, says “Not quadratic” if a is 0 , and >> otherwise uses the quadratic formula to find the values of x, >> reporting them in a vector. >> >> quad 2 _8 6 >> 3 1 >> >> quad 0 _8 6 >> Not quadratic >> >> --Kip Murray >> >> >> >> > ---------------------------------------------------------------------- > 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
