A Discrete Dipole Approximation Solver Based on the COCG-FFT Algorithm and Its Application to Microwave Breast Imaging

Table 3

Comparison of computation times as a function of conjugate gradient scheme accuracy tolerances.

	Tolerance = 1e-5				Tolerance = 1e-3
	COCG	COCG-FFT	COCR	COCR-FFT	COCG	COCG-FFT	COCR	COCR-FFT
MATLAB	0.3351	0.4090	0.3749	0.4042	0.2061	0.2694	0.2344	0.2613
C++	0.3470	0.1655	0.3741	0.1665	0.3237	0.1073	0.2648	0.1080