@Jon -- let me draw your attention to an ongoing discussion in the J programming forum on this very topic: "Tacit J and indexed replacement" http://www.jsoftware.com/pipermail/programming/2014-July/037968.html Right now we're discussing Amend } and its (perceived) ill-adaptation to the tasks it's (apparently) meant for.
IanClark On Wed, Jul 9, 2014 at 4:32 AM, Jon Hough <[email protected]> wrote: > Ok, I see now. It's just using ammend. It was there in nuvoc the whole > time. Not sure how I missed that. > > Thanks. > > --- Original Message --- > > From: "'Pascal Jasmin' via Programming" <[email protected]> > Sent: July 9, 2014 11:52 AM > To: [email protected] > Subject: Re: [Jprogramming] Modifying single element of List or Table > > (<'fish') 2} ;: 'cat dog fiosh cow monkey' > ┌───┬───┬────┬───┬──────┐ > │cat│dog│fish│cow│monkey│ > └───┴───┴────┴───┴──────┘ > 5 (4 5 6}) 3 1 4 1 7 9 2 6 5 > 3 1 4 1 5 5 5 6 5 > > > > > ________________________________ > From: Jon Hough <[email protected]> > To: "[email protected]" <[email protected]> > Sent: Tuesday, July 8, 2014 10:31:03 PM > Subject: [Jprogramming] Modifying single element of List or Table > > > > I want to modify an element of a list, leaving other elements unchanged. > > e.g. > > > > list =. ;: 'cat dog fiosh cow monkey' > > > list > > > ┌───┬───┬─────┬───┬──────┐ > │cat│dog│fiosh│cow│monkey│ > └───┴───┴─────┴───┴──────┘ > > > I want to change 'fiosh' to 'fish', e.g. change a spelling mistake. It > would also be preferable to do this in-place because I don't want to copy > the list. > > Or, another example, > > > arr =. 3 1 4 1 7 9 2 6 5 > > arr > > 3 1 4 1 7 9 2 6 5 > > I want 4{arr to become 5, not 7. How can I do this modification? This > seems simple, but I just realized I don't know how to do it in J. > > Regards. > > ---------------------------------------------------------------------- > 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
