diff options
author | Gael Guennebaud <g.gael@free.fr> | 2009-07-05 11:33:55 +0200 |
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committer | Gael Guennebaud <g.gael@free.fr> | 2009-07-05 11:33:55 +0200 |
commit | c6f610093bff10c5a6e4fac94bfed422ba54b39a (patch) | |
tree | da30a412eb2c03edbccebfd9a4d0170f6dcf74f4 /doc | |
parent | eec334c604d3fbd0ab7fcb0d9380f87c943afc90 (diff) |
add a VectorBlock expr as a specialization of Block
Diffstat (limited to 'doc')
-rw-r--r-- | doc/examples/class_FixedVectorBlock.cpp | 26 | ||||
-rw-r--r-- | doc/examples/class_VectorBlock.cpp | 26 |
2 files changed, 52 insertions, 0 deletions
diff --git a/doc/examples/class_FixedVectorBlock.cpp b/doc/examples/class_FixedVectorBlock.cpp new file mode 100644 index 000000000..c176be495 --- /dev/null +++ b/doc/examples/class_FixedVectorBlock.cpp @@ -0,0 +1,26 @@ +#include <Eigen/Core> +USING_PART_OF_NAMESPACE_EIGEN +using namespace std; + +template<typename Derived> +Eigen::VectorBlock<Derived, 2> +firstTwo(MatrixBase<Derived>& v) +{ + return Eigen::VectorBlock<Derived, 2>(v.derived(), 0); +} + +template<typename Derived> +const Eigen::VectorBlock<Derived, 2> +firstTwo(const MatrixBase<Derived>& v) +{ + return Eigen::VectorBlock<Derived, 2>(v.derived(), 0); +} + +int main(int, char**) +{ + Matrix<int,1,6> v; v << 1,2,3,4,5,6; + cout << firstTwo(4*v) << endl; // calls the const version + firstTwo(v) *= 2; // calls the non-const version + cout << "Now the vector v is:" << endl << v << endl; + return 0; +} diff --git a/doc/examples/class_VectorBlock.cpp b/doc/examples/class_VectorBlock.cpp new file mode 100644 index 000000000..d979f973a --- /dev/null +++ b/doc/examples/class_VectorBlock.cpp @@ -0,0 +1,26 @@ +#include <Eigen/Core> +USING_PART_OF_NAMESPACE_EIGEN +using namespace std; + +template<typename Derived> +Eigen::VectorBlock<Derived> +segmentFromRange(MatrixBase<Derived>& v, int start, int end) +{ + return Eigen::VectorBlock<Derived>(v.derived(), start, end-start); +} + +template<typename Derived> +const Eigen::VectorBlock<Derived> +segmentFromRange(const MatrixBase<Derived>& v, int start, int end) +{ + return Eigen::VectorBlock<Derived>(v.derived(), start, end-start); +} + +int main(int, char**) +{ + Matrix<int,1,6> v; v << 1,2,3,4,5,6; + cout << segmentFromRange(2*v, 2, 4) << endl; // calls the const version + segmentFromRange(v, 1, 3) *= 5; // calls the non-const version + cout << "Now the vector v is:" << endl << v << endl; + return 0; +} |