J finally gets it right !
f=: 13 :'+/3^-i.y'
f
[: +/ 3 ^ [: - i.
f 10
1.49997
f 11
1.49999
f 12
1.5
f 100
1.5
f 1e5
1.5
f 1e10
|domain error: f
| f 1e10
f 1e100
|domain error: f
| f 1e100
f 1e1000
|domain error: f
| f _
This last result shouldn't be a domain error, should it? Eugene would have
liked it.
5!:4 <'f'
-- [:
+- / --- +
│
--+ -- 3
│ +- ^
L-----+ -- [:
L---+- -
L- i.
Linda
-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Roger Hui
Sent: Saturday, December 22, 2012 2:26 AM
To: Programming forum
Subject: Re: [Jprogramming] Re : Sigma notation
> Lambda considered harmful? LOL
No, sigma considered harmful. In conventional notation there's big sigma
for summation and big pi for product. But how do you do max insert (>./)?
Min insert (<./)? And insert (^./)? Etc.
Infinite series (products, etc.) best done by having infinite vectors. See
*Remembering Eugene McDonnell*<
<http://www.jsoftware.com/papers/eem/eemapl2010.htm>
http://www.jsoftware.com/papers/eem/eemapl2010.htm>
i. 4
0 1 2 3
i. _
0 1 2 3 4 5 ...
+/ 3 ^ - i. _
1.5
and *Bring Something Beautiful* < <http://archive.vector.org.uk/art10500390>
http://archive.vector.org.uk/art10500390> .
On Fri, Dec 21, 2012 at 11:08 PM, Alex Giannakopoulos <
<mailto:[email protected]> [email protected]> wrote:
> Very nice, Linda, thanks.
> That's just the example I needed.
>
> I think I'm beginning to get the 'geist' of it now!
>
> (Lambda considered harmful? LOL)
> ----------------------------------------------------------------------
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>
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