矩阵映射、合并【Eigen】

矩阵映射【Eigen】

https://www.cnblogs.com/bokeyuan-dlam/articles/15928341.html
Eigen中向量默认为列向量

映射

映射共用地址空间，block、和data

int data[] = {1,2,3,4,5,6,7,8,9};
tmpMapInt = coupleM2.block(0, 0, 2, 4);
MapTypeInt tmpMapInt(data, tmpN1, tmpN2);   // m2map shares data with m2

合并、赋值

合并和直接赋值会开辟新的空间

Matrix<int, Dynamic, Dynamic>  tmpqqq = tmpMapInt;  
coupleM1 << tmpMapInt, tmp1;

保留源矩阵 拼接

conservativeResize保留源矩阵数据

mat.conservativeResize(mat.rows() + 1, mat.cols());
mat.row(mat.rows() - 1) = new_node;//行末尾赋值