Approximating the Inverse of a Square Matrix with Application in Computation of the Moore-Penrose Inverse

Table 1

Results of comparisons for Example 7.

	Methods
	(1)	(3)	(4)	(9)
Convergence rate	2	3	3	7
Iteration number	3	2	2	1
Residual norm	8.32717×10^−7	1.21303×10^−7	5.10014×10^−8	9.7105×10^−8
No. of nonzero ele.	591107	720849	800689	762847
Time (in seconds)	4.22	4.05	9.32	4.18