ar =: 1 : '5!:1 <''u''' [ `(1 ar)`] ┌─┬─────┬─┐ │[│┌─┬─┐│]│ │ ││0│1││ │ │ │└─┴─┘│ │ └─┴─────┴─┘
[ `(1 ar)`]} [`1`]} The above is a user error. Spec for } requires middle tine to be a verb such as: [`1:`]} this is possibly a lr error, [`1`] |domain error | [`1`] [`1`]} |domain error | [`1`]} but the following will crash J (804 or 805, qt windows 64bit) 3 [`(1 ar)`]} i.5 even though its hard to accidentally insert a noun into a gerund with `, user conjunctions can make it easier to build gerund of mixed types. Perhaps it is worthwhile for },@.,^: to check for verb within gerund, or if the cost is the same, to automagically use N"_ ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm