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Table 9 Average distance between the inferred and true tree ancestors for IDQPSO, Simulated Annealing and GRAPPA

From: Achieving large and distant ancestral genome inference by using an improved discrete quantum-behaved particle swarm optimization algorithm

Program

Distance to the true ancestor (No transposition)

r = 20

r = 40

r = 60

r = 80

r = 100

r = 120

r = 140

r = 160

r = 180

IDQPSO-Median

0

0

0

0

0.2

0.3

5.2

7.7

43.8

SA-Median

0

0

0

0.8

1.9

2.0

7.3

27.8

55.0

GRAPPA-Exact

0

0

0

0

–

–

–

–

–

Program

Distance to the true ancestor (90% inversions/10% transpositions)

r = 20

r = 40

r = 60

r = 80

r = 100

r = 120

r = 140

r = 160

r = 180

IDQPSO-Median

0

0.2

0

1.7

2.0

10.1

47.7

53.0

99.6

SA-Median

0

0.2

0

2.1

3.1

13.9

69.8

60.6

115.4

GRAPPA-Exact

0

0.2

0

–

–

–

–

–

–

  1. – indicates a program cannot finish the scoring of any tree after 5 days of computation. For the IDQPSO and Simulated Annealing methods, results for \(r\ge 140\) are from the best trees obtained within 5 days of computation
  2. The best values of all the compared algorithms are indicated in italics