by using &> instead of &.> you end up comparing scalar vs list when starting from the right.
([ -. -.)&.>/(<'rcyshqp'),(<'jbdnpe'),(<'zgp'),<'pnjtz' ┌─┐ │p│ └─┘ On Thursday, December 17, 2020, 05:57:13 p.m. EST, Brian Schott <[email protected]> wrote: I am trying to use the verb `intersection` shown below as found https://code.jsoftware.com/wiki/Vocabulary/minusdot . But I get the following peculiar result on AOC#6 when applying it with intersection for the following data. Am I applying these primitives incorrectly? intersection [ -. -. #intersection&>/(<'rcyshqp'),(<'jbdnpe'),(<'zgp'),<'pnjtz' NB. should be 1 2 #intersection&>/|.(<'rcyshqp'),(<'jbdnpe'),(<'zgp'),<'pnjtz' NB. rotated argument produces 1 here 1 intersection&>/|.(<'rcyshqp'),(<'jbdnpe'),(<'zgp'),<'pnjtz' NB. no blank lines p intersection&>/(<'rcyshqp'),(<'jbdnpe'),(<'zgp'),<'pnjtz' NB. Notice blank lines here p JVERSION Engine: j807/j64/darwin Release-c: commercial/2019-02-24T10:50:40 Library: 8.07.26 Platform: Darwin 64 Installer: J807 install InstallPath: /users/brian/j64-807 Contact: www.jsoftware.com -- (B=) ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
