https://code.jsoftware.com/wiki/System/ReleaseNotes/J902 helps.
Language extension - semiduals: x u&.:(a:`v) y is equivalent to v^:_1 x u v y . That is, it is like x u&.:v y except that v is applied only to y . Similarly, x u&.:(v`a:) y is equivalent to v^:_1 (v x) u y . Forms with &. are also supported, with the verb having ranks taken from the verb that is applied to the argument. Nice. it applies to both &. and &.: Scratch the request for new mnemonics unless the only valuable version is u&.:(a:`v) On Thursday, May 14, 2020, 06:59:54 p.m. EDT, 'Pascal Jasmin' via Programming <programm...@jsoftware.com> wrote: > u0`u1`...@v is that supposed to be @. (agenda?) > x u&.:(a:`v) y nice, except that it may be hard to write. Assume that these are equivalents (for monad) u&.:v : ([ u v@]) NB. &..: u&.:v : (v@[ u ]) NB. &.:: Perhaps &..: and &.:: would make better implementations? On Thursday, May 14, 2020, 05:27:44 p.m. EDT, Henry Rich <henryhr...@gmail.com> wrote: This beta has a few language changes: * Fold (u F:. v) has been redefined to execute v first, then, u * u0`u1`...@v now has infinite rank. v is executed first to decide the cell-rank, and which verb is to be executed for each cell; then the u verbs are executed, either one cell at a time or in one call to each verb, to execute on a list of cells at once. Therefore, each u verb needs to be able to handle single cell or a list of input cells. * semiduals are supported at last: x u&.:(v`a:) y applies v only to x, and x u&.:(a:`v) y applies v only to y. Henry Rich On 5/14/2020 3:49 PM, Eric Iverson wrote: > The first 902 beta release is available for windows/macos/linux. > > https://code.jsoftware.com/wiki/System/Installation/J902 > > Availability of new releases will be announced here. > > Questions, problems, etc should be addressed to the beta forum. > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm -- This email has been checked for viruses by AVG. https://www.avg.com ---------------------------------------------------------------------- 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
