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'''Discrete dipole approximation codes'''. This is a list of Discrete Dipole Approximation (DDA) codes. The "code" here indicates computer code, a particular implementation of the DDA (many of them are [[open-source]]). For theoretical approach see [[Discrete dipole approximation]] article.
Most of the codes apply to arbitrary-shaped inhomogeneous nonmagnetic particles and particle systems in free space or homogeneous dielectric host medium. The calculated quantities typically include the [[Mueller_calculus#Mueller_matrices|Mueller matrices]], [[Cross_section_(physics)#Scattering_of_light|integral cross-sections]] (extinction, absorption, and scattering), internal fields and angle-resolved scattered fields (phase function). There are some published comparisons of existing DDA codes.<ref name=penttila2007/>
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These codes typically use regular grids (cubical or rectangular cuboid), [[conjugate gradient method]] to solve large [[System of linear equations|systems of linear equations]], and FFT-acceleration of the matrix-vector products which uses convolution theorem. Complexity of this approach is almost linear in number of dipoles for both time and memory.<ref name=Yurkin2007a/>
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| style="background-color: #ffffff;" | [https://gitlab.com/dmcxu1/cpdda CPDDA]
| style="background-color: #ffffff;" | Dibo Xu and others
| style="background-color: #ffffff;" | <ref name="Xu2025" />
| style="background-color: #ffffff;" | Python
| style="background-color: #ffffff;" | 2025
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These list include codes that do not qualify for the previous section. The reasons may include the following: source code is not available, [[Fast Fourier transform|FFT]] acceleration is absent or reduced, the code focuses on specific applications not allowing easy calculation of standard scattering quantities.
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