Extrapolation Algorithm for Computing Multiple Cauchy Principal Value Integrals

Table 4

Errors of the rectangle rule with and

n
64	−2.3835e − 01	−2.3005e − 02	−2.3005e − 02	−2.3036e − 02	−5.7772e − 02
128	−1.5647e − 01	−8.5913e − 03	−8.5913e − 03	1.2073e − 02	−4.0355e − 02
256	−9.8100e − 02	−2.9871e − 03	−2.9871e − 03	1.7480e − 02	−2.6800e − 02
512	−5.9436e − 02	−9.8785e − 04	−9.8785e − 04	1.4112e − 02	−1.7061e − 02
1024	−3.5070e − 02	−3.1487e − 04	−3.1487e − 04	9.5823e − 03	−1.0489e − 02
	0.6912	1.5478	1.5939	0.3164	0.6154