Research Article

Exploring Further Advantages in an Alternative Formulation for the Set Covering Problem

Table 11

Landscape metrics for each instance and ACO approach.

Instd-ACOn-ACO
QMetricSSpeedSRateQMetricSSpeedSRate

4_10.00080.51070.10001.00000.83660.9667
4_20.17770.42480.16671.00000.71901.0000
4_30.00190.00000.00000.44670.51190.4333
4_40.00270.00000.00000.01140.63000.1000
4_50.50290.61510.50000.56950.79790.5667
4_60.64730.54450.63331.00000.69310.8667
4_70.06690.83100.06671.00000.83820.9333
4_80.67510.61440.66671.00000.84251.0000
4_90.00050.00000.00000.10450.44000.1000
4_101.00000.84971.00001.00000.90801.0000

5_10.33360.46220.33330.63350.59030.6333
5_20.00000.00000.00000.00070.00000.0000
5_30.43340.59650.43331.00000.80980.9333
5_41.00000.69871.00001.00000.86501.0000
5_50.00000.86400.03330.63330.80660.6333
5_61.00000.91831.00001.00000.96151.0000
5_70.00090.00000.00000.00170.78000.2000
5_80.53400.54480.53331.00000.82151.0000
5_90.40170.55280.40001.00000.87751.0000
5_100.46690.64160.46671.00000.82160.9667

6_10.23590.48030.23330.56960.71150.5667
6_21.00000.82680.86671.00000.74770.9333
6_31.00000.79020.96671.00000.91301.0000
6_41.00000.87911.00001.00000.96451.0000
6_50.23550.78400.23330.53500.75160.5333

a_10.00370.00000.00000.05170.00000.0000
a_20.00010.00000.00000.22020.70750.2000
a_30.03370.00000.00000.03370.00000.0000
a_40.03060.06100.03330.67690.54400.6667
a_50.03500.59550.06670.67720.61530.6667

b_11.00000.91801.00001.00000.95101.0000
b_21.00000.95841.00001.00000.88101.0000
b_31.00000.95311.00001.00000.95951.0000
b_41.00000.94871.00001.00000.94251.0000
b_51.00000.99901.00001.00000.98501.0000

c_10.00210.00000.00000.00860.97000.0333
c_20.01200.00000.00000.01200.00000.0000
c_30.00550.00000.00000.07850.00000.0000
c_41.00000.69530.96671.00000.62301.0000
c_50.09250.68100.03330.09180.89500.0333

d_10.50690.53340.30001.00000.66350.7667
d_21.00000.68610.93331.00000.72750.8000
d_30.32800.80200.10000.59680.67750.4000
d_41.00000.97681.00001.00000.98501.0000
d_51.00000.92881.00001.00000.91151.0000

nre_11.00000.99001.00001.00000.99501.0000
nre_20.93190.72680.63331.00000.79060.8333
nre_31.00000.86290.93331.00000.89471.0000
nre_40.94990.83360.73331.00000.80860.9667
nre_51.00000.98001.00001.00000.98771.0000

nrf_11.00000.97171.00001.00000.97821.0000
nrf_21.00000.98471.00001.00000.98981.0000
nrf_30.96210.87700.33330.96210.76200.3333
nrf_41.00000.94070.96671.00000.96831.0000
nrf_50.94410.69800.16670.94410.86500.0667

nrg_10.75280.36130.50001.00000.47600.8667
nrg_20.24630.00000.00000.35550.00000.0000
nrg_30.08080.00000.00000.11230.00000.0000
nrg_40.17620.00000.00000.20260.00000.0000
nrg_50.63740.23500.20000.85500.32030.6000

nrh_10.78800.00000.00000.81350.00000.0000
nrh_20.81360.00000.00000.83980.00000.0000
nrh_30.81480.00000.00000.81480.27000.0333
nrh_40.83920.00000.00000.84840.59000.0333
nrh_51.00000.54070.96671.00000.66701.0000