Detailed Description

template<typename XprType, typename RowIndices, typename ColIndices>
class Eigen::IndexedView< XprType, RowIndices, ColIndices >

Expression of a non-sequential sub-matrix defined by arbitrary sequences of row and column indices.

Template Parameters

XprType	the type of the expression in which we are taking the intersections of sub-rows and sub-columns
RowIndices	the type of the object defining the sequence of row indices
ColIndices	the type of the object defining the sequence of column indices

This class represents an expression of a sub-matrix (or sub-vector) defined as the intersection of sub-sets of rows and columns, that are themself defined by generic sequences of row indices \( \{r_0,r_1,..r_{m-1}\} \) and column indices \( \{c_0,c_1,..c_{n-1} \}\). Let \( A \) be the nested matrix, then the resulting matrix \( B \) has m rows and n columns, and its entries are given by: \( B(i,j) = A(r_i,c_j) \).

The RowIndices and ColIndices types must be compatible with the following API:

<integral type> operator[](Index) const;

Index size() const;

Eigen::Index

EIGEN_DEFAULT_DENSE_INDEX_TYPE Index

The Index type as used for the API.

Definition Meta.h:83

Typical supported types thus include:

std::vector<int>
std::valarray<int>
std::array<int>
Eigen::ArrayXi
decltype(ArrayXi::LinSpaced(...))
Any view/expressions of the previous types
Eigen::ArithmeticSequence
Eigen::internal::AllRange (helper for Eigen::placeholders::all)
Eigen::internal::SingleRange (helper for single index)
etc.

In typical usages of Eigen, this class should never be used directly. It is the return type of DenseBase::operator()(const RowIndices&, const ColIndices&).

See also: class Block

Inherits Eigen::internal::IndexedViewImpl< XprType, RowIndices, ColIndices, internal::traits< XprType >::StorageKind,(internal::traits< IndexedView< XprType, RowIndices, ColIndices > >::Flags &DirectAccessBit) !=0 >.

The documentation for this class was generated from the following file:

IndexedView.h