Re: [Jprogramming] Fwd: Re: extended precision essay

Mon, 29 Apr 2019 10:51:30 -0700 


Sent from my Samsung device


-------- Original message --------
From: 'Mike Day' via Programming <[email protected]> 
Date: 29/04/2019  18:33  (GMT+00:00) 
To: Programming forum <[email protected]> 
Subject: [Jprogramming] Fwd: Re: extended precision essay 

As may be seen,  Roger Hui felt unable to advise re my private enquiry 
on one of his essays
in the J Wiki.  Anyone else feel like commenting on the apparently 
unproductive lines of
code?
Thanks,
Mike


-------- Forwarded Message --------
Subject: Re: extended precision essay
Date: Wed, 24 Apr 2019 19:00:47 -0700
From: Roger Hui <[email protected]>
To: Mike Day <[email protected]>



Hi Mike.  Thanks for you msg. I am heavily engaged in other matters now, 
so if you want to have a more timely answer I suggest you query 
[email protected] <mailto:[email protected]>.



On Tue, Apr 23, 2019 at 6:58 AM Mike Day <[email protected] 
<mailto:[email protected]>> wrote:

    Dear Roger,

    I've been trying to use material from your Essay on extended precision
    functions at

    
https://code.jsoftware.com/wiki/Essays/Extended_Precision_Functions#Utilities

    and am puzzled by apparently unproductive code in the hyperbolic
    functions,

    eg

    sinh=: DP&$: : (4 : 0) " 0
       if. x>10^.|y do. (1r2*_1^0>y)*x exp |y end.
       if. 1<|y do. -:-/x exp y,-y end.
       e=. 0.1^x
       n=. e (>i.1:) y (^%!@]) 1+2*i.>.0.5*y^.e
       +/(x:!.0 y) (^%!@]) 1+2x*i.n
    )

    I would expect the if statements either

         to modify or produce values for use later in the function

    or

        to have a "return." before the "end."

    Not at all important,  but I'd welcome your ideas when you have time.


    Very sad about John Scholes.  I'd guess you enjoyed your collaboration
    at Dyalog,

    Best Wishes

    Mike



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