I'm looking for help with a simple programming problem.

Suppose my data consists of integers, and I have a classification to a
small number of values.

For example

f=:1+*
data=:_3 1 0 1 _1 0 _10 _2 _4 6

    f data
0 2 1 2 0 1 0 0 0 2

I then want to organize the data into boxes based on these values, for
example

+---------------+---+-----+
|_3 _1 _10 _2 _4|0 0|1 1 6|
+---------------+---+-----+

I got this using

(0 1 2=/f data) <@# data

Is there a simpler or better way?

Best wishes,

John

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