> Then it actually does in-place updating (even though, at face value, J syntax does not permit such a thing).
Please explain why this is not permitted by J syntax. On Tue, Sep 9, 2014 at 8:28 AM, Ian Clark <earthspo...@gmail.com> wrote: > Roger's confidence that (a=: 100 (2}) a) is the best way is due to his > knowledge that J has special support for this construct, provided the same > name (viz. a) is used on both sides of the copula. Then it actually does > in-place updating (even though, at face value, J syntax does not permit > such a thing). > > See the details at: > http://www.jsoftware.com/jwiki/Vocabulary/curlyrt#dyadic > ...down at the bottom under the heading: "Use These Combinations". > > All this is advanced stuff for a beginner. Considerations like those raised > in this thread doubtless made Devon McCormick omit Amend } from his > "Minimal Beginning J" proposal (7 days ago, thread: "J Kernel"), in favor > of using }. and {. as Sebastian proposed. > > On Mon, Sep 8, 2014 at 4:51 PM, Jose Mario Quintana < > jose.mario.quint...@gmail.com> wrote: > > > Linda wrote: > > " > > The verb is amend and the main issue is that you must separate 100 and 2 > or > > they become the list 100 2 > > " > > > > Actually, amend (}) is an adverb and the verb is (2}). > > > > Roger wrote: > > " > > a=: 100 (2}) a > > " > > > > The form that Roger gave makes that apparent: > > > > test=. 2} > > type'test' > > ┌────┐ > > │verb│ > > └────┘ > > > > > > > > > > On Mon, Sep 8, 2014 at 11:13 AM, Linda Alvord <lindaalv...@verizon.net> > > wrote: > > > > > The verb is amend and the main issue is that you must separate 100 > and 2 > > > or > > > they become the list 100 2 > > > > > > 100 (2)} A=.i.5 > > > 0 1 100 3 4 > > > > > > (100) 2} A=.i.5 > > > 0 1 100 3 4 > > > > > > > > > Linda > > > > > > -----Original Message----- > > > From: programming-boun...@forums.jsoftware.com > > > [mailto:programming-boun...@forums.jsoftware.com] On Behalf Of Roger > Hui > > > Sent: Monday, September 08, 2014 10:21 AM > > > To: Programming forum > > > Subject: Re: [Jprogramming] Replace one item of a list > > > > > > a=: i.5 > > > a > > > 0 1 2 3 4 > > > a=: 100 (2}) a > > > a > > > 0 1 100 3 4 > > > > > > > > > > > > On Mon, Sep 8, 2014 at 7:18 AM, Sebastian <seb_fo...@arcor.de> wrote: > > > > > > > Hi, > > > > > > > > What is actually the best practice to replace one item of a list? > > > > > > > > The only way I know feels a bit complicated: > > > > > > > > a =: i. 5 > > > > 0 1 2 3 4 > > > > > > > > > > > > > > > > (2 {. a), 100, (3 }. a) > > > > > > > > 0 1 100 3 4 > > > > > > > > > > > > > > > > Best regards, > > > > > > > > Sebastian > > > > > ---------------------------------------------------------------------- > > > > 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
