Hello J'ers Even if a complex number is actually real it may display nonzero imaginary part because of round-off errors. Adding and subtracting 1e6j1e6 removes the round-off error, but is there a better or more general solution?
UM=.%:%~_1^]%~[:+:[:*/~i. NB. Unitary Matrix generator rd=.]&.(1e6j1e6&+) NB. round-off cleaner u=.n+/ .*+n=.UM 3 NB. unit matrix u NB. ugly display 1 _2.78e_17j_1.11e_16 1.11e_16j_2.22e_16 _2.78e_17j1.11e_16 1 _2.78e_17j_1.11e_16 1.11e_16j2.22e_16 _2.78e_17j1.11e_16 1 rd u NB. nice display 1 0 0 0 1 0 0 0 1 ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
