J arrays must be rectangualar, which means have the same number of cells
along each dimension. The 2nd row of a table can't be shorter than the 5th
row. The 18th plane in a cube (hyperrectangle) can't have fewer rows than
the 107th plane in that same cube. Recursively: an array is a
1-dimensional
(r90&.>)^:(i.3) < mat
+-+---+-+
|0 1 2|3 0|5 4 3|
|3 4 5|4 1|2 1 0|
| |5 2| |
+-+---+-+
--Kip Murray
Sent from my iPad
> On Apr 22, 2014, at 10:20 AM, "Francesco Pedulla'" wrote:
>
> Hello everybody,
> I am using J801 under Ubuntu. Here is a behaviour I do not unders
I don't know the answer to you question. Maybe this will be helpful. You
can rename so you will find the names to be useful.
]A=:i.2 3
0 1 2
3 4 5
]B=:i.3 3
0 1 2
3 4 5
6 7 8
f=: 13 :'|:|.y'
f A
3 0
4 1
5 2
f B
6 3 0
7 4 1
8 5 2
f f B
8 7 6
5 4 3
2 1 0
f f f B
2 5 8
1 4 7
You are concatenating a 2x3 and a 3x2 matrices. They must be expanded to
3x3 to conform. Then filled.
On Apr 22, 2014 9:20 AM, "Francesco Pedulla'" wrote:
> Hello everybody,
> I am using J801 under Ubuntu. Here is a behaviour I do not understand:
>
>mat=:i.2 3
>r90=:|."1@:|:"2
>r90^:0
Hello everybody,
I am using J801 under Ubuntu. Here is a behaviour I do not understand:
mat=:i.2 3
r90=:|."1@:|:"2
r90^:0 mat
0 1 2
3 4 5
r90^:1 mat
3 0
4 1
5 2
r90^:2 mat
5 4 3
2 1 0
So far, so good. But:
r90^:(i.3) mat
0 1 2
3 4 5
0 0 0
3 0 0
4 1 0
5 2 0
5 4 3
2 1 0
0 0 0
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early rate.
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Make your commitment now! The fee jumps quite a bit in just over a week.
You get bigger round-off errors when computing the difference between
logarithms than when computing the logarithm of the ratio. That's why a
logarithmic mean of almost equal numbers turned out very badly.
(-/@:^. ,. ^.@:%/)1e13+?2 6$0
_3.55271e_15 _3.10862e_15
1.42109e_14 1.53211e_14
3.5
You're right! (lousy proofreading.) I'm getting better at reading all your
"slight of hand".
Linda
-Original Message-
From: programming-boun...@forums.jsoftware.com
[mailto:programming-boun...@forums.jsoftware.com] On Behalf Of Bo Jacoby
Sent: Tuesday, April 22, 2014 2:47 AM
To: programm.
