Index finite lists of positive integers: Difference between revisions
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changes would be required if using jaq as jaq does not (as of this writing in 2024) support |
changes would be required if using jaq as jaq does not (as of this writing in 2024) support |
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the `include` or `module` directives. |
the `include` or `module` directives. |
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=== |
===Bijective map based on Fibonacci encoding=== |
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<syntaxhighlight lang="jq"> |
<syntaxhighlight lang="jq"> |
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include "fibonacci" {search: "./"}; # see https://rosettacode.org/wiki/Category:Jq/fibonacci.jq |
include "fibonacci" {search: "./"}; # see https://rosettacode.org/wiki/Category:Jq/fibonacci.jq |
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map(fibencode | map(tostring) | join("")) |
map(fibencode | map(tostring) | join("")) |
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| join("") |
| join("") |
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| explode | reverse | implode ; |
| explode | reverse[1:] | implode ; |
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def unrank: |
def unrank: |
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"1" + tostring |
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| explode | reverse | implode |
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| split("11") |
| split("11") |
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| .[:-1] |
| .[:-1] |
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50544 |
50544 |
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], |
], |
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"encoded": 10000010101010101010000110010010100010100100011100101000010100010100111001000010010010000100110010001001010010101011100000001000000000010111000101001010010101000101101001000010001001000001100010001000100000000001110000100100000010001000011000010101001000001001, |
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"encoded": 110000010101010101010000110010010100010100100011100101000010100010100111001000010010010000100110010001001010010101011100000001000000000010111000101001010010101000101101001000010001001000001100010001000100000000001110000100100000010001000011000010101001000001001, |
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"check": true |
"check": true |
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} |
} |
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