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

Table 2

Computation times for the power of 2 optimized grid size.

Direct

COCG

COCR

COCG-FFT

COCR-FFT

#dipoles

MATLAB

C++ (Armadillo)

MATLAB

C++ (Armadillo)

MATLAB

C++ (Armadillo)

MATLAB

C++

MATLAB

C++

Armadillo

FFTW

Armadillo

FFTW

4225

1.7129

31.7440

0.6444

0.5555

0.6461

0.5836

0.7637

0.5689

0.2746

0.5785

0.5366

0.2758