Roger Hui knows the path that got me here. Linda
-----Original Message----- From: programming-boun...@forums.jsoftware.com [mailto:programming-boun...@forums.jsoftware.com] On Behalf Of Linda Alvord Sent: Monday, September 03, 2012 4:00 AM To: programm...@jsoftware.com Subject: Re: [Jprogramming] Scalar to Vector - Yet again Thanks to all! Kip Murray showed me that I am dealing with a noun that is a table and not an atom! His solution ,A turns a list into an atom. ]A=:1 1$4 4 ]C=:'' ]B=:3 5 7 ]B=:3 5 7 3 5 7 Two alternatives helped: B+A |length error | B +A B+{.@,A NB. Bill Lam 7 8 9 B+''$,AN NB. Henry Rich 7 8 9 B+{.,A 7 8 9 I add the third because I try to avoid @ and I create the problem most often by using { All work if the noun is empty. C+{.@,A C+''$,A C+{.,A So this thread really should be called: Table to Atom - First time around. Linda -----Original Message----- From: programming-boun...@forums.jsoftware.com [mailto:programming-boun...@forums.jsoftware.com] On Behalf Of Henry Rich Sent: Monday, September 03, 2012 1:16 AM To: programm...@jsoftware.com Subject: Re: [Jprogramming] Scalar to Vector - Yet again The easiest way to make a scalar of an arbitrary noun is ''($,)A which will work on anything except an empty A. Henry Rich On 9/2/2012 10:52 PM, Roger Hui wrote: > You are (probably) trying to undo years of conditioning in APL, which > has the misguided "singleton extension": In APL, > 2 3 4 + (?n⍴1)⍴5 > worked. Singleton extension is undesirable because it complicates the > rules for the rank operator. > >> It feels wrong to have to do things like this every time I want to >> use the result of a previous computation called A . > > Alternatively, it feels wrong that A is non-scalar as computed. > > > > On Sun, Sep 2, 2012 at 6:48 PM, Linda Alvord <lindaalv...@verizon.net>wrote: > >> I finally think I know what I don't know. I want to turn "table" A >> into a scalar (which it happens to look like). >> >> A >> 4 >> $A >> 1 1 >> B=:3 5 7 >> A+B >> |length error >> | A +B >> (,A)+B >> |length error >> | (,A) +B >> (,3$A)+B >> 7 9 11 >> (,($B)$A)+B >> 7 9 11 >> >> It feels wrong to have to do things like this every time I want to >> use the result of a previous computation called A . >> >> Linda >> >> -----Original Message----- >> From: programming-boun...@forums.jsoftware.com >> [mailto:programming-boun...@forums.jsoftware.com] On Behalf Of Linda >> Alvord >> Sent: Saturday, September 01, 2012 7:26 PM >> To: programm...@jsoftware.com >> Subject: Re: [Jprogramming] Scalar to Vector - Yet again >> >> I wasn't thinking. A isn't a scalar. I even knew it had shape 1 1 . >> >> A >> 4 >> $A >> 1 1 >> $3 2 >> 2 >> 2$A >> 4 >> 4 >> 3 2 + ,2$A >> 7 6 >> >> This works! Thanks. >> >> Linda >> >> -----Original Message----- >> From: programming-boun...@forums.jsoftware.com >> [mailto:programming-boun...@forums.jsoftware.com] On Behalf Of km >> Sent: Saturday, September 01, 2012 6:10 PM >> To: programm...@jsoftware.com >> Subject: Re: [Jprogramming] Scalar to Vector - Yet again >> >> ,4 is a vector >> >> Sent from my iPad >> >> >> On Sep 1, 2012, at 4:56 PM, "Linda Alvord" <lindaalv...@verizon.net> >> wrote: >> >>> I vow to remember how to do this, and several months later I forget >>> and can't find it >>> >>> anywhere. Is there some way to get to the example from the >>> vocabulary >> page? >>> Maybe I can remember that. >>> >>> >>> >>> A=:1 1$4 >>> >>> 3 2 + A >>> >>> |length error >>> | 3 2 +A >>> >>> >>> >>> Thanks. >>> >>> >>> >>> Linda >>> >>> -------------------------------------------------------------------- >>> -- 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 >> > ---------------------------------------------------------------------- > 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
