Vocabulary/bslashco
Jump to navigation
Jump to search
>> << Down to: Dyad Back to: Vocabulary Thru to: Dictionary
\: y Grade Down
Rank Infinity -- operates on x and y as a whole, by items of y -- WHY IS THIS IMPORTANT?
The permutation that sorts list y into descending order (numerical or lexicographical)
Companion verb to /:
] p=: \: Wk 3 2 4 0 6 1 5 p { Wk +--+--+--+--+--+--+--+ |We|Tu|Th|Su|Sa|Mo|Fr| +--+--+--+--+--+--+--+ ] Wko=: > Wk Su Mo Tu We Th Fr Sa p { Wko NB. also works with unboxed list We Tu Th Su Sa Mo Fr
See Also
- Grade Up /:
- Entry in the J Dictionary for \:
x \: y Sort
Rank Infinity -- operates on x and y as a whole, by items -- WHY IS THIS IMPORTANT?
Applies to list x the permutation that sorts list y into descending order (numerical or lexicographical)
Companion verb to /:
(100+i.7) \: Wk 103 102 104 100 106 101 105
Common uses
Sort a list y into descending order
(Wk is as defined above)
tros=: \:~ NB. (/:~ y) is the same as: (y /: y) tros Wk +--+--+--+--+--+--+--+ |We|Tu|Th|Su|Sa|Mo|Fr| +--+--+--+--+--+--+--+
See Also
- Grade Up /:
- Entry in the J Dictionary for \: