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`a`b`c`d`k!(0 1 7 8;,2;3 4 6;,5;,9) |
`a`b`c`d`k!(0 1 7 8;,2;3 4 6;,5;,9) |
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</pre> |
</pre> |
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The [[keys]] from the '''group''' dictionary represent the [[distinct]] elements of the array. |
The [[keys]] from the '''group''' dictionary represent the [[distinct]] elements of the array. |
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"abrcd" |
"abrcd" |
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</pre>{{Works in|ngn/k}} |
</pre>{{Works in|ngn/k}} |
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In K2 and K3, the group primitive returns a nested array:<pre> |
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="abracadabra" |
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(0 3 5 7 10 |
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1 8 |
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2 9 |
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,4 |
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,6) |
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</pre>{{Works in|Kona}} |
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In order to mimic the K6 behaviour, you can use [[distinct]]: <code>{(?x)!=x}</code> to get a dict. |
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<pre> |
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{(?:x)!=x}`a`a`b`c |
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.((`a |
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0 1 |
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) |
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(`b |
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,2 |
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) |
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(`c |
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,3 |
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)) |
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</pre>{{Works in|Kona}} |
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Revision as of 05:36, 11 July 2021
Group
=x
The group primitive, denoted by =, is used to group the indices of an array by the values they represent in the array, returning a dictionary.
=`a`a`b`c`c`d`c`a`a`k `a`b`c`d`k!(0 1 7 8;,2;3 4 6;,5;,9)
The keys from the group dictionary represent the distinct elements of the array.
="abracadabra" "abrcd"!(0 3 5 7 10;1 8;2 9;,4;,6) !="abracadabra" "abrcd" ?"abracadabra" "abrcd"
Works in: ngn/k
In K2 and K3, the group primitive returns a nested array:
="abracadabra" (0 3 5 7 10 1 8 2 9 ,4 ,6)
Works in: Kona
In order to mimic the K6 behaviour, you can use distinct: {(?x)!=x} to get a dict.
{(?:x)!=x}`a`a`b`c
.((`a
0 1
)
(`b
,2
)
(`c
,3
))
Works in: Kona