Roger, Any insight as to why 7 is a magic number?
BTW. neat piece of replacement to produce _*i.8. Though it does depend on 0 = x * 0 , rather than _ = _ * x (x scalar). Is this type of replacement general where the interpreter needs to keep a vector? Ian -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Roger Hui Sent: Friday, February 12, 2010 3:17 AM To: General forum Subject: Re: [Jgeneral] Bond to vector of infinity Fixed for the next release. Thank you for finding and reporting this error. ----- Original Message ----- From: Ian Shannon <[email protected]> Date: Wednesday, February 10, 2010 22:35 Subject: [Jgeneral] Bond to vector of infinity To: "[email protected]" <[email protected]> > > Hi there, > > Notification of a interpreter error. The error is something like: > If a vector to be bonded (on either left or right) includes infinity > (+ and/or -) and is longer than 7 items then interpreter returns NaN > error. > > However if vector is longer than 7 items the interpreter > (cleverly) can sometimes optimise. > Eg 0 _ _ _ _ _ _ _ _ _ becomes > (_*i.10) and error does not occur. > > > > J602 on win XP SP2. > > > ========= > NB. Display of interpreter error > 9!:12 '' > 6 > 9!:14 '' > j602/2008-03-03/16:45 > ,&_ _ _ _ _ _ > ┌─┬─┬───────────┐ > │,│&│_ _ _ _ _ _│ > └─┴─┴───────────┘ > ,& _ _ _ _ _ _ _ > ┌─┬─┬─────────────┐ > │,│&│_ _ _ _ _ _ _│ > └─┴─┴─────────────┘ > ,& _ _ _ _ _ _ _ _ > |NaN error > ,& __ __ __ __ __ __ __ > ┌─┬─┬────────────────────┐ > │,│&│__ __ __ __ __ __ __│ > └─┴─┴────────────────────┘ > ,& __ __ __ __ __ __ __ __ > |NaN error > ,& 0 __ __ __ __ __ __ __ __ > ┌─┬─┬─────────────────────────┐ > │,│&│0 __ __ __ __ __ __ __ __│ > └─┴─┴─────────────────────────┘ > ,& 0 __ __ __ __ __ __ __ __ 0 > ┌─┬─┬───────────────────────────┐ > │,│&│0 __ __ __ __ __ __ __ __ 0│ > └─┴─┴───────────────────────────┘ > ,& __ __ __ __ 0 0 0 0 > |NaN error > ,& __ __ __ 0 0 0 0 > ┌─┬─┬────────────────┐ > │,│&│__ __ __ 0 0 0 0│ > └─┴─┴────────────────┘ > > > 7 appears to be the magic number for the length of the constant > vector to bond. > > The error also occurs when bonding with other functions (on both > left and right). > > > Note I cannot use the wiki > http://www.jsoftware.com/jwiki/System/Interpreter/Bugs > > as it won't let me reset the password - it says that recovery > token (copied out of return email) is invalid. Please let > me know how to get into the system. > > > Ian ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------------------------------------------------------------------------------------------------------- This email is intended for the addressee(s) named and may contain confidential and/or privileged information. If you are not the intended recipient, please notify the sender and then delete it immediately. Any views expressed in this email are those of the individual sender except where the sender expressly and with authority states them to be the views of the Department of Environment, Climate Change & Water NSW. ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
