Re: [Bug-apl] Identify function

Juergen Sauermann Wed, 02 Jul 2014 05:37:29 -0700

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 anon-numeric argument. When Dyalog introduced the identity function,they deprecated use of + as identity; perhaps they're attempting tomove closer to standards conformance in this case.

On Tue, Jul 1, 2014 at 9:56 AM, Elias Mårtenson <loke...@gmail.com<mailto:loke...@gmail.com>> 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 <da...@lamkins.net
    <mailto:da...@lamkins.net>> 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
        <da...@lamkins.net <mailto:da...@lamkins.net>> 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 <juergen.sauerm...@t-online.de
            <mailto:juergen.sauerm...@t-online.de>>

                To: "Elias Mårtenson" <loke...@gmail.com
                <mailto:loke...@gmail.com>>
                Cc: "bug-apl@gnu.org <mailto:bug-apl@gnu.org>"
                <bug-apl@gnu.org <mailto:bug-apl@gnu.org>>
                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

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--
"The secret to creativity is knowing how to hide your sources."
   Albert Einstein


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Re: [Bug-apl] Identify function

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