source: pacpussensors/trunk/Vislab/lib3dv-1.2.0/lib3dv/eigen/doc/MatrixfreeSolverExample.dox

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2namespace Eigen {
3
4/**
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6\eigenManualPage MatrixfreeSolverExample Matrix-free solvers
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8Iterative solvers such as ConjugateGradient and BiCGSTAB can be used in a matrix free context. To this end, user must provide a wrapper class inheriting EigenBase<> and implementing the following methods:
9 - Index rows() and Index cols(): returns number of rows and columns respectively
10 - operator* with and Eigen dense column vector
11 - resize(rows,cols): needed for source compatibility (can stay empty)
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13Eigen::internal::traits<> must also be specialized for the wrapper type.
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15For efficiency purpose, one might also want to provide a custom preconditioner. Here is an example using ConjugateGradient and implementing also a custom Jacobi preconditioner:
16\include matrixfree_cg.cpp
17Output: \verbinclude matrixfree_cg.out
18
19*/
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21}
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