[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Bug-apl] Identify function
|
From: |
David B. Lamkins |
|
Subject: |
Re: [Bug-apl] Identify function |
|
Date: |
Wed, 02 Jul 2014 11:23:00 -0700 |
Nice! Thank you.
On Wed, 2014-07-02 at 14:36 +0200, Juergen Sauermann wrote:
> Hi,
>
> I have added monadic ⊣ and ⊢ see SVN 355.
>
> Instead of making them identical I though it might be better to do
> different things. What I came up with is this:
>
> ⊢ B returns (a copy of) B as a normal APL value.
> ⊣ B also returns a copy of B, but as a committed APL value.
>
> Thus ⊣ can be used (instead of 0 0⍴) to supppress the display of a
> value:
>
> ⊢1 2 3
> 1 2 3
>
> ⊣ 1 2 3
> (nothing)
>
>
> /// Jürgen
>
>
> On 07/01/2014 07:02 PM, David Lamkins wrote:
>
> > Further insights here:
> >
> > http://aplwiki.com/Left,%20Right,%20or%20the%20Same%3F
> >
> >
> >
> > BTW, note that ISO APL conjugate returns DOMAIN ERROR for a
> > non-numeric argument. When Dyalog introduced the identity function,
> > they deprecated use of + as identity; perhaps they're attempting to
> > move closer to standards conformance in this case.
> >
> >
> >
> >
> > On Tue, Jul 1, 2014 at 9:56 AM, Elias Mårtenson <address@hidden>
> > wrote:
> > Exactly, and since an identity function is useful it makes
> > sense to map it to the same symbol as Dyalog.
> >
> >
> > Regards,
> > Elias
> >
> >
> > On 2 July 2014 00:55, David Lamkins <address@hidden>
> > wrote:
> > Digging further, it's interesting to note that ISO
> > APL defines + as conjugate, but does not have a
> > binding for the identity function.
> >
> >
> >
> > On Tue, Jul 1, 2014 at 9:42 AM, David Lamkins
> > <address@hidden> wrote:
> > I looked this up yesterday. Dialog version
> > 13 introduced the use of the tack as
> > identity and repurposed + as conjugate.
> > (Actually, they bound both left and right
> > tacks identically, even though they call
> > left tack "same" and right tack "identity".)
> > If the argument of conjugate is imaginary,
> > conjugate returns the number with the
> > imaginary part negated. If the argument of
> > conjugate is real or non-numeric, conjugate
> > returns the argument unchanged.
> >
> >
> >
> >
> >
> > From: Juergen Sauermann
> > <address@hidden>
> > To: "Elias Mårtenson"
> > <address@hidden>
> > Cc: "address@hidden"
> > <address@hidden>
> > Date: Tue, 01 Jul 2014 17:04:24
> > +0200
> > Subject: Re: [Bug-apl] Identify
> > function
> > Hi Elias,
> >
> > I looked in "Mastering APL" from
> > Dyalog and could not find it.
> > They call + the identity function.
> >
> > And what would be the use of it?
> >
> > /// Jürgen
> >
> >
> > --
> > "The secret to creativity is knowing how to
> > hide your sources."
> > Albert Einstein
> >
> >
> > http://soundcloud.com/davidlamkins
> > http://reverbnation.com/lamkins
> > http://reverbnation.com/lcw
> > http://lamkins-guitar.com/
> > http://lamkins.net/
> > http://successful-lisp.com/
> >
> >
> >
> > --
> > "The secret to creativity is knowing how to hide
> > your sources."
> > Albert Einstein
> >
> >
> > http://soundcloud.com/davidlamkins
> > http://reverbnation.com/lamkins
> > http://reverbnation.com/lcw
> > http://lamkins-guitar.com/
> > http://lamkins.net/
> > http://successful-lisp.com/
> >
> >
> >
> >
> >
> > --
> > "The secret to creativity is knowing how to hide your sources."
> > Albert Einstein
> >
> >
> > http://soundcloud.com/davidlamkins
> > http://reverbnation.com/lamkins
> > http://reverbnation.com/lcw
> > http://lamkins-guitar.com/
> > http://lamkins.net/
> > http://successful-lisp.com/
>