Same thing! I just ended up with different order in the train and a superfluous rank operator:
hft=: +>/~@i.@#"_*|:@:+ ishermitian A 0 ishermitian hft A 1 Always nice to see Raul's solution too! Esa -----Original Message----- From: programming-boun...@forums.jsoftware.com [mailto:programming-boun...@forums.jsoftware.com] On Behalf Of Aai Sent: 15. tammikuuta 2013 15:05 To: programm...@jsoftware.com Subject: Re: [Jprogramming] Hermitian from triangular Why is it easy? From the point of view of a mathematician perhaps. I just experimented towards the desired result. ishermitian ((]+[*~:) +@|:) A 1 ishermitian (+ +@|: * >/~@i.@#) A 1 On 15-01-13 11:25, km wrote: > This is an easy one. A Hermitian matrix matches its conjugate transpose. > Write a verb hft that creates a Hermitian matrix from a triangular one that > has a real diagonal. > > ishermitian =: -: +@|: > ]A =: 2 2 $ 1 2j3 0 4 > 1 2j3 > 0 4 > ]B =: hft A > 1 2j3 > 2j_3 4 > ishermitian A > 0 > ishermitian B > 1 > > Kip Murray > > Sent from my iPad > ---------------------------------------------------------------------- > For information about J forums seehttp://www.jsoftware.com/forums.htm -- Met vriendelijke groet, @@i = Arie Groeneveld ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
