Match worked already so your expression worked, too.
((f 3 4)-:g 3 4)
1
A-:*&.+.B
1
However, your expression did what I wanted.
*&.+.B
1 0j1 _1 0j_1
1 0j1 _1 0j_1
1 0j1 _1 0j_1
QuadCT seems to have floated into my memory. As I remember it allows you
to set the precision you want to use to require two arrays to be considered
equal. Is there such a thing in J?
Linda
-----Original Message-----
From: programming-boun...@forums.jsoftware.com
[mailto:programming-boun...@forums.jsoftware.com] On Behalf Of Brian Schott
Sent: Sunday, March 03, 2013 7:07 AM
To: programm...@jsoftware.comc
Subject: Re: [Jprogramming] Hermitian from triangular
Is this what you mean?
A-:*&.+.B
1
On Sun, Mar 3, 2013 at 4:30 AM, Linda Alvord <lindaalv...@verizon.net>
wrote:
> I was rereading this thread and I remember that in APL there is a
> function that can be applied to B to get A. Is there an equivalent
function in J?
>
> f=: 13 :'^@o.j.0.5*i.y'
> ]A=: f 3 4
> 1 0j1 _1 0j_1
> 1 0j1 _1 0j_1
> 1 0j1 _1 0j_1
>
> g=: 13 :'([:^o.)j.0.5*i.y'
> B=:g 3 4
> 1 6.12323e_17j1 _1j1.22465e_16 _1.83697e_16j_1
> 1j_2.44929e_16 3.06162e_16j1 _1j3.67394e_16 _4.28626e_16j_1
> 1j_4.89859e_16 5.51091e_16j1 _1j6.12323e_16 _2.44991e_15j_1
>
> ((f 3 4)-:g 3 4)
> 1
>
> Linda
>
--
(B=)
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