I'm glad this little sequence was in the middle of the night so I could correct it myself. Here's the better example. The negative domain is fine if you give both x and y that you want to plot!
load 'plot' x=: i: 5 y=:x^2 plot x;y -----Original Message----- From: programming-boun...@jsoftware.com [mailto:programming-boun...@jsoftware.com] On Behalf Of Linda Alvord Sent: Monday, March 19, 2012 3:18 AM To: 'Programming forum' Subject: Re: [Jprogramming] Several questions about j Ooops. I had rearranged my e-mail by order of the sender, and I thought I was in "current" time so I responded to an e-mail from August 15, 2011. However, I guess my comments are just as troubling as they would have been then. What about the negative numbers in the x-axis? Linda -----Original Message----- From: programming-boun...@jsoftware.com [mailto:programming-boun...@jsoftware.com] On Behalf Of Linda Alvord Sent: Monday, March 19, 2012 3:11 AM To: 'Programming forum' Subject: Re: [Jprogramming] Several questions about j In my first example plot didn't do a good job with i:5 . The y-axis is labeled correctly but the x-axis is not. This is a better example of a plot. (The actual plot doesn't copy into an e-mail.) The axes are labeled correctly. load 'plot' x=:i.6 f=: 13 :'x^2' g=: 13 :'x^3' h=: 13 :'(f - g)x' h [: (f - g) [ h x 0 0 _4 _18 _48 _100 i=: 13 :'(f x)-g x' i x 0 0 _4 _18 _48 _100 plot h x Actually the problem appears to be with negative numbers in the domain. This will also not show the x-axis correctly. x=:_5+i.11 x _5 _4 _3 _2 _1 0 1 2 3 4 5 y=: 13 :'x^2' plot y x Linda -----Original Message----- From: programming-boun...@jsoftware.com [mailto:programming-boun...@jsoftware.com] On Behalf Of Kim Kuen Tang Sent: Monday, August 15, 2011 5:09 AM To: programming@jsoftware.com Subject: [Jprogramming] Several questions about j Hi everyone, here are some newbie questions regarding the differences between j and kdb. Are verbs ( dyad or monad) first-class citizen in j? Is it possible to forward a verb to another verb? Is it possible to box a verb into list ? Is it possible to have a dictionary like the case in kdb? Something like : (`a`b`c)!(1 2 3) What i want to do in j is to program a verb (i will call it p) that will accept a monad and output a plot of this monad. For example: f=. 3: 0 'y^2' p=. (implementation) p f will output the plot of f between -5 and 5. Thanks for any comments and answers. Reagrds, Kim ---------------------------------------------------------------------- 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
