Agreed.
-M
At 2017-07-01 15:26, you wrote:
I think the inconsistency you are pointing to here is that r. as a
verb has a different meaning from r in number formation?
But I think that that's a red herring. For example, e. as a verb has a
different meaning from e in number formation.
Thanks,
--
Raul
On Sat, Jul 1, 2017 at 7:34 AM, Martin Kreuzer <[email protected]> wrote:
> Looking at (r.) Angle, which is a verb somewhat similar to (j.) Complex, I
> get
> 2 r. 0.2
> 1.96013j0.397339
> 2 r.0.2
> 1.96013j0.397339
> 2 r. 2
> _0.832294j1.81859
> 2 r.2
> _0.832294j1.81859
> which all four look fine to me, but are not constistent with (j.)'s
> behaviour, that's been my point ...
> and then there is this construct
> 2r.2
> 10
> which doesn't have anything to do with (r.) Angle but is a (fractional)
> constant of value 2/0.2 showing another instance of .2 being interpreted as
> 0.2 which is not accepted in other circumstances.
> -M
> At 2017-07-01 10:50, you wrote:
>> 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.
>>
>> áñ, 01 øÃû 2017, Martin
Kreuzer ýðÿøà ðû(ð):
>>
>> > 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 âÃÃill-formed
number̢̈ is because "j." is ais a
>> > > > verb,
>> > > quite different to
âÃÃjÃjâÃà which is part of a noun construct
>> > > (likke 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
âÃÃj.âÃà verb with a space either
>> > > > > > side to
>> > > make it clear to J that this is not
âÃÃ1jxxxâÃà where J would
>> > > assume ume 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 âìÃcomplex
>> > > constants̢̈ entered directrectly
using the j notation (as a continuous
>> > > sequence of non-blank chars)âÃæ
>>
>> > > > 3j4 NBB. 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
>> > > ----------------------------------------------------------------------
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>> >
>> > ----------------------------------------------------------------------
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>>
>> --
>> 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
> ----------------------------------------------------------------------
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