method

indices

Ruby latest stable (v2_5_5) - 0 notes - Class: EratosthenesSieve

1_8_6_287
1_8_7_72
1_8_7_330
1_9_1_378
1_9_2_180 (0)
1_9_3_125 (0)
1_9_3_392 (0)
2_1_10
2_2_9
2_4_6
2_5_5
2_6_3
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Method deprecated or moved

This method is deprecated or moved on the latest stable version. The last existing version (v1_9_3_392) is shown here.

indices(n) private

for an odd number n, returns (i, j, k) such that @tables[i][j][k] represents primarity of the number

Show source

# File lib/prime.rb, line 460
    def indices(n)
      #   binary digits of n: |0|1|2|3|4|5|6|7|8|9|10|11|....
      #   indices:            |-|    k  |  j  |     i
      # because of NUMS_PER_ENTRY, NUMS_PER_TABLE

      k = (n & 0b00011111) >> 1
      j = (n & 0b11100000) >> 5
      i = n >> 8
      return i, j, k
    end

indices

Related methods

Method deprecated or moved

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