": seems to work with all your examples, and does 6 decimal places automagically.
----- Original Message ----- From: Ian Clark <earthspo...@gmail.com> To: programm...@jsoftware.com Cc: Sent: Tuesday, August 25, 2015 10:41 PM Subject: [Jprogramming] Format a floating number without rounding errors Can anyone tell me how to define a verb: format which returns a numeral string for a noun z of datatype: 'floating' which is formally identical to the original definition of z, viz format 'z' [z=: 5.13 5.13 format 'z' [z=: 5.13e_7 5.13e_7 format 'z' [z=: 5e_7 5e_7 format 'z' [z=: 5e_4 0.0005 Hitherto I've been using 5!:5 -which gives (or exposes) rounding errors format=: 5!:5&< format 'z' [z=: 5.13 5.12999999999999989 format 'z' [z=: 5.13e_7 5.13000000000000001e_7 format 'z' [z=: 5e_7 4.99999999999999977e_7 format 'z' [z=: 5e_4 0.00050000000000000001 I want it to work with the full range of exponents and up to 6 decimal places (say) of mantissa. JVERSION Engine: j803/2014-10-19-11:11:11 Library: 8.03.13 Qt IDE: 1.3.1/5.3.2 Platform: Darwin 64 Installer: J803 install InstallPath: /applications/j64-803 ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
