Extrapolation Algorithm for Computing Multiple Cauchy Principal Value Integrals

Table 3

Errors of the rectangle rule with and

n
64	−7.7845e − 02	−1.8981e − 02	−6.3590e − 02	−6.9936e − 02	−1.4985e − 02
128	−5.0142e − 02	−9.6972e − 03	−3.3326e − 02	−3.5663e − 02	−8.1438e − 03
256	−3.0714e − 02	−4.8309e − 03	−1.7118e − 02	−1.7883e − 02	−4.2928e − 03
512	−1.8182e − 02	−2.3911e − 03	−8.6906e − 03	−8.9255e − 03	−2.2176e − 03
1024	−1.0503e − 02	−1.1842e − 03	−4.3828e − 03	−4.4522e − 03	−1.1308e − 03
	0.7225	1.0006	0.9647	0.9934	0.9320