(1 2 3 4 perm each 4) { each <1 3 5 7
Untested. Or,
1 2&p.&.> 1 2 3 4 perm each 4
Also untested.
Henry Rich
On 12/5/2018 8:45 PM, Skip Cave wrote:
I want to generate all the 1, 2, 3, & 4 permutations of 4 items.
I can generate the indices:
(1 2 3 4 perm each 4)
┌─┬───┬─────┬───────┐
│0│0 1│0 1 2│0 1 2 3│
│1│1 0│0 2 1│0 1 3 2│
│2│0 2│1 0 2│0 2 1 3│
│3│2 0│1 2 0│0 2 3 1│
│ │0 3│2 0 1│0 3 1 2│
│ │3 0│2 1 0│0 3 2 1│
│ │1 2│0 1 3│1 0 2 3│
│ │2 1│0 3 1│1 0 3 2│
│ │1 3│1 0 3│1 2 0 3│
│ │3 1│1 3 0│1 2 3 0│
│ │2 3│3 0 1│1 3 0 2│
│ │3 2│3 1 0│1 3 2 0│
│ │ │0 2 3│2 0 1 3│
│ │ │0 3 2│2 0 3 1│
│ │ │2 0 3│2 1 0 3│
│ │ │2 3 0│2 1 3 0│
│ │ │3 0 2│2 3 0 1│
│ │ │3 2 0│2 3 1 0│
│ │ │1 2 3│3 0 1 2│
│ │ │1 3 2│3 0 2 1│
│ │ │2 1 3│3 1 0 2│
│ │ │2 3 1│3 1 2 0│
│ │ │3 1 2│3 2 0 1│
│ │ │3 2 1│3 2 1 0│
└─┴───┴─────┴───────┘
How can I apply those indices to a 4-element vector consisting of the
integers 1 3 5 7, in order to generate all the 1, 2, 3, & 4 permutations of
those 4 integers?
(1 2 3 4 perm each 4) each {1 3 5 7
|domain error: each
| (1 2 3 4 perm each 4) each{1 3 5 7
Fail!
Skip
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