q-lang-users

[q-lang-users] Unparsing of Complex

[Albert G. <Dr....@t-...>]

Hi all,

I just don't seem to be capable to decide this on my own, so please help. :)

What's the right way to unparse complex 0 Y? Currently it's just "Y*i". 
But "0+Y*i" might actually be preferable, because it makes the unparsing 
of Complex more regular, and it's also the way that Octave and Matlab do 
it, so it might be considered "the standard".

TIA,
Albert

-- 
Dr. Albert Gr"af
Dept. of Music-Informatics, University of Mainz, Germany
Email:  Dr....@t-..., ag...@mu...
WWW:    http://www.musikinformatik.uni-mainz.de/ag

[q-lang-users] Unparsing of Complex

[Rob H. <hub...@gm...>]

On 27/06/06, Albert Graef <Dr....@t-...> wrote:
> What's the right way to unparse complex 0 Y? Currently it's just "Y*i".
> But "0+Y*i" might actually be preferable, because it makes the unparsing
> of Complex more regular, and it's also the way that Octave and Matlab do
> it, so it might be considered "the standard".

You have already argued that X+0*i should not be parsed as just X,
even when the 0 is exact, in order that the value should appear to be
the complex value that it is. I agree.

Given that X+0*i is unparsed as X+0*i, then by symmetry 0+Y*i should
be unparsed as 0+Y*i.

That's my oar in.
Rob.

[q-lang-users] Unparsing of Complex

[Rob H. <hub...@gm...>]

On 27/06/06, Rob Hubbard <hub...@gm...> wrote:
> Given that X+0*i is unparsed as X+0*i, then by symmetry 0+Y*i should
> be unparsed as 0+Y*i.

PS. I notice (at 7.2rc3) that 0.0+Y*i is already unparsed as 0.0+Y*i;
as the 0.0 is inexact, and therefore should be considered to be only
possibly zero but perhaps an absolutely small value (as John has
previously noted). Thus to unparse 0+Y*i as 0+Y*i would also look more
consistent with that.

Re: [q-lang-users] Unparsing of Complex

[Albert G. <Dr....@t-...>]

Rob Hubbard wrote:
> You have already argued that X+0*i should not be parsed as just X,
> even when the 0 is exact, in order that the value should appear to be
> the complex value that it is. I agree.
> 
> Given that X+0*i is unparsed as X+0*i, then by symmetry 0+Y*i should
> be unparsed as 0+Y*i.

Yes. Fixed in cvs already.

-- 
Dr. Albert Gr"af
Dept. of Music-Informatics, University of Mainz, Germany
Email:  Dr....@t-..., ag...@mu...
WWW:    http://www.musikinformatik.uni-mainz.de/ag