Your saying _. is indeterminate and has nothing to do with the IEEE spec of
Nan doesn't make it so. Our conclusions are that trying to make J 'above
that' is a fools game that has a very high performance cost for all fp
operations. The hard, unavoidable fact is that J uses the IEEE fp spec as
provided by the hardware and compiler. To do otherwise is not worth the
effort and has far too high a cost.
If you are interested and concerned about _. (whatever it is called), I
strongly suggest you take a look at what is in the current beta as that is
what is going to be in the release.
----- Original Message -----
From: "Henry Rich" <[EMAIL PROTECTED]>
To: "'Beta forum'" <[email protected]>
Sent: Sunday, February 24, 2008 11:47 AM
Subject: [Jbeta] Use of the name 'NaN' deprecated
Roger and Eric have referred to NaN in their messages. I suggest
that this usage should be avoided.
NaN is meaningful only in reference to the IEEE floating-point
spec.
J is above that. J deals with numbers. Floating-point is an
implementation detail that should not be alluded to in the
description of the language.
_. is indeterminate. It is not NaN. For one thing, it is
a number (at least it used to be - I haven't had the courage
to move to rbeta yet), while NaN is explicitly not a number.
And, there are many values and kinds of NaN, but only one
indeterminate.
So, NaNs in external sources produce unpredictable results.
Use of _. produces unpredictable results. But they are
not the same things.
Henry Rich
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Eric Iverson
Sent: Sunday, February 24, 2008 9:37 AM
To: Beta forum
Subject: Re: [Jbeta] issues not yet resolved
I am sorry to say that we won't get fixes for these two
problems into this
release. We have just run out of time and need to get this
release out so we
can clear the decks for the next round of activities. The NaN
problem turned
into a surprisingly difficult mess and took much longer than expected.
Your two bugs will be at the top of the list for 602.
----- Original Message -----
From: "bill lam" <[EMAIL PROTECTED]>
To: "Beta forum" <[email protected]>
Sent: Saturday, February 02, 2008 12:05 AM
Subject: [Jbeta] issues not yet resolved
> [Jbeta] for-loop, continue, switch-case 30 Sep 2007
> http://www.jsoftware.com/pipermail/beta/2007-September/002383.html
>
> [Jbeta] m&i. and boxed unicode 30 Sep 2007
> http://www.jsoftware.com/pipermail/beta/2007-September/002382.html
>
> Will they be fixed?
>
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