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Grade Down | \: _ _ _ | Sort Down

`\:` grades any argument, yielding a permutation vector;`(\:y){y` sorts`y` in descending order. For example:
       ]g=:\:y=:3 1 4 2 1 3 3
    2 0 5 6 3 1 4

       g{y
    4 3 3 3 2 1 1
|  | `x\:y` is`(\:y){x` ;`` i.e.,`x` is sorted to an order specified by`y` .`` In particular,`y\:y` (or`\:~y`)`` sorts`y` . For example:
       \:~"1 'dozen',:'disk'
    zoned
    skid

Elements of`\:y` that select equal elements of`y` are in ascending order. If`y` is a table,`\:y` grades the base value of the rows, using a base larger than twice the magnitude of any of the elements. Higher ranks are treated as`,.y` (as if the items were each ravelled).
If`y` is literal,`\:y` grades according to the collating sequence specified by the alphabet`a.` ;`` another collating sequence`cs` can be imposed by grading`cs i. y` .`` For example:

       ]n=: 3 1 4 1 6,2 7 1 8 3,:6 1 8 0 3
    3 1 4 1 6
    2 7 1 8 3
    6 1 8 0 3

       \: n
    2 0 1

       \:~ >;:'when eras die, their legacies'
    when
    their
    legacies
    eras
    die
    ,

See Grade Up`` (`/:`)`` for the treatment of complex and boxed arguments.

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