我无法重新分配Block
。在下面的代码我的矩阵A
存储在两种不同的方式:如何更改特征块?
- 为3
ArrayXd
S,一个用于每个行 - 作为
ArrayXXd
。
// data
ArrayXXd A (3, 3);
A << 0, 1, 2, 3, 4, 5, 6, 7, 8;
std::vector<ArrayXd> A_rows = {A.row(0), A.row(1), A.row(2)};
// std::vector<ArrayXd> solution
// first row
ArrayXd & current_row = A_rows[0];
// read it, write it, do stuff
// start working with the second row
current_row = std::ref(A_rows[1]);
cout << current_row << endl << endl; // prints 3 4 5
cout << A << endl; // A is unchanged
// Eigen solution
// first row
Block<ArrayXXd, 1, -1> && current_row_block = A.row(0);
// read it, write it, do stuff
// start working with the second row
current_row_block = std::ref(A.row(1)); // doesn't compile
cout << current_row_block << endl;
cout << A << endl;
的错误信息是:
error: use of deleted function 'void std::ref(const _Tp&&) [with _Tp = Eigen::Block<Eigen::Array<double, -1, -1>, 1, -1, false>]'
current_row_block = std::ref(A.row(1));
^
是否有可能以固定第二方法或我应该移动到存储所述矩阵为std::vector<ArrayXd>
?
相关问题:Passing a reference of a vector element to a threaded function
你想避免使用'Eigen :: Map'吗? –
@AviGinsburg,并不特别。当我完成时,我正在考虑使用它将'std :: vector'转换为'ArrayXXd'。你有什么想法? –
user357269
为什么首先要有一个'std :: vector'? –