this is parsed as a token ;:'3e.4' +----+ |3e.4| +----+ but it (rightfully?) throws an error 3e.4 |ill-formed number
this is also parsed as a token ;:'3j.4' +----+ |3j.4| +----+ the behavior seems endemic 3p.4 4.74221 3ad.4 2.99993j0.0209438 3ar.4 2.76318j1.16826 3x.4 4.47547 3b.4 1.33333 I think either 3e.4 should be legal or all others should be illegal for consistent. Сб, 01 июл 2017, Martin Kreuzer написал(а): > Looking at the examples, I came across the difference between > > 3 j. 4 NB. spaces > 3j4 > > and > > 3j.4 NB. no spaces > 3j0.4 > > Given that this (rightfully) throws an error > > .2 .3 .4 .5 > |syntax error > | .2 .3 .4 .5 > > while this doesn't > > 0.2 0.3 0.4 0.5 > 0.2 0.3 0.4 0.5 > > why then is the construct 3j.4 valid..? > > -M > > > At 2017-07-01 04:43, you wrote: > > > > As Henry points out, the NuVoc page is quite a bit clearer on this topic. > > > > Sample google search: > > site:jsoftware.com inurl:nuvoc complex > > > > Quite a bit of reading there, if you have the patience for it (be sure > > to mix in plenty of trial and error, though, or it's a total snoozer). > > > > Thanks, > > > > -- > > Raul > > > > > > On Fri, Jun 30, 2017 at 11:30 PM, Rob Hodgkinson <[email protected]> wrote: > > > Hi Lawrence, the âill-formed numberâ is because "j." is a verb, > > quite different to âjâ which is part of a noun construct (like 3j4, > > or 1e3 for 1000). > > > > > So in your examples ... > > > > > NB. But wait, not so fast: > > > 1j.(2^0.5)%2 > > > |ill-formed number > > > NB. No > > > > > NB. Now try to separate the âj.â verb with a space either side to > > make it clear to J that this is not â1jxxxâ where J would assume you > > are trying to make a complex constant. > > > 1 j. (2^0.5)%2 > > > 1j0.707107 > > > > > The reason is that J can also directly interpret âcomplex > > constantsâ entered directly using the j notation (as a continuous > > sequence of non-blank chars)⦠> > > 3j4 NB. This is a single complex constant 3+i4 > > > 3j4 > > > > > 3 j4 NB. But now J tries to view this as a list of (3) and (j4) > > which which J would assume is (3) and a variable called (j4). > > > |syntax error > > > | 3 j4 > > > > > As Henry points out, the NuVoc page is quite a bit clearer on this topic. > > > > > HTH, Regards Rob > > > > > > >> On 1 Jul 2017, at 1:14 pm, Lawrence Wickert <[email protected]> > > wrote: > > >> > > >> Hello, I am a old EE still trying to learn. I am a real beginner > > having no end of problems with specifying complex numbers. I am using > > j64-804 on ubuntu 12.04. I am either doing something really stupid or I > > need to update to 806. Updating anything gives me heartburn or worse so > > I hope it is just my misunderstanding of basic principles. Although I > > have a bad habit of RTFM as a last resort I have tried the Dictionary to > > no avail. I appreciate any guidance. > > >> > > >> 0j(2^0.5)%2 > > >> |ill-formed number > > >> > > >> 0j((2^0.5)%2) > > >> |ill-formed number > > >> > > >> j.(2^0.5)%2 > > >> 0j0.707107 > > >> NB. Eureaka, OK, I get it! > > >> > > >> NB. But wait, not so fast: > > >> 1j.(2^0.5)%2 > > >> |ill-formed number > > >> NB. No > > >> > > >> 1j(2^0.5)%2 > > >> |ill-formed number > > >> NB. Still No > > >> > > >> 1+j.(2^0.5)%2 > > >> 1j0.707107 > > >> NB. This works! > > >> > > >> Let's try to do something with it: > > >> k=:(0 1+j.(2^0.5)%2 3 4 0 5) > > >> |length error > > >> | k=:(0 1 +j.(2^0.5)%2 3 4 0 5) > > >> > > >> NB. Maybe parantheses will help: > > >> k=:(0 (1+j.(2^0.5)%2) 3 4 0 5) > > >> |syntax error > > >> | k=:( 0(1+j.(2^0.5)%2)3 4 0 5) > > >> > > >> NB. This one has to work: > > >> k=:(0 1j0.7071 3 4 0 5) > > >> k > > >> 0 1j0.7071 3 4 0 5 > > >> NB. It does but it can't be the only way to do it. > > >> > > >> NB. One last rry: > > >> g=: 1+j.(2^0.5)%2 > > >> g > > >> 1j0.707107 > > >> NB. That's nice. > > >> > > >> k=:(0 g 3 4 0 5) > > >> |syntax error > > >> | k=:( 0 g 3 4 0 5) > > >> NB. This isn't nice. > > >> > > >> Lost in the high desert of New Mexico, Larry Wickert > > >> > > >> ---------------------------------------------------------------------- > > >> For information about J forums see http://www.jsoftware.com/forums.htm > > > > > ---------------------------------------------------------------------- > > > For information about J forums see http://www.jsoftware.com/forums.htm > > ---------------------------------------------------------------------- > > For information about J forums see http://www.jsoftware.com/forums.htm > > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm -- regards, ==================================================== GPG key 1024D/4434BAB3 2008-08-24 gpg --keyserver subkeys.pgp.net --recv-keys 4434BAB3 gpg --keyserver subkeys.pgp.net --armor --export 4434BAB3 ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
