Okay, bear with me - I'm 2 days into J programming...
I have a (large) dataset, A, which contains n columns, the first a number
in {1,2,...,m_1}, the
second a number in {1,2,...,m_2}, and so on. I then have a second dataset,
B, which contains
all the possible permutations. As a simple example, set n=2, m_1=2 and
m_2=3. Then B is
1 1
1 2
1 3
2 1
2 2
2 3
Let's also say that A is
2 1
2 2
1 3
2 1
2 1
1 2
1 1
(but, again, I will typically have many more rows than this for A). I was
hoping I could do
something like A = tr(B), or:
2 1 = (1 1) (1 2) (1 3) (2 1) (2 2) (2 3)
2 2 = (1 1) (1 2) (1 3) (2 1) (2 2) (2 3)
1 3 = (1 1) (1 2) (1 3) (2 1) (2 2) (2 3)
2 1 = (1 1) (1 2) (1 3) (2 1) (2 2) (2 3)
2 1 = (1 1) (1 2) (1 3) (2 1) (2 2) (2 3)
1 2 = (1 1) (1 2) (1 3) (2 1) (2 2) (2 3)
1 1 = (1 1) (1 2) (1 3) (2 1) (2 2) (2 3)
which would give:
0 0 0 1 0 0
0 0 0 0 1 0
0 0 1 0 0 0
0 0 0 1 0 0
0 0 0 1 0 0
0 1 0 0 0 0
1 0 0 0 0 0
I have tried several approaches, but can't quite get there. Any suggestions
would be much
appreciated...
Thanks
Chris Hansen
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