我有一个指向列主 C double 数组的指针，它想转换成 arma::mat我从文档中了解到这也是专栏主要的。
我看过函数std::transform但我相信 std 中的矩阵是行优先的。在 Armadillo 包中有 conv_to<mat>::from()这似乎适用于 std::array或 arma::mat ，这是否适用于列主 C 数组？
你能告诉我如何将C结构传递给arma::mat吗？无需复制并返回到 C 数组？
非常感谢
最佳答案
来自 Armadillo 的文档: ( http://arma.sourceforge.net/docs.html#Mat )
Advanced constructors
mat(ptr_aux_mem, n_rows, n_cols, copy_aux_mem = true, strict = false)Create a matrix using data from writable auxiliary (external) memory, where ptr_aux_mem is a pointer to the memory. By default the matrix allocates its own memory and copies data from the auxiliary memory (for safety). However, if copy_aux_mem is set to false, the matrix will instead directly use the auxiliary memory (ie. no copying); this is faster, but can be dangerous unless you know what you're doing!
The strict parameter comes into effect only when copy_aux_mem is set to false (ie. the matrix is directly using auxiliary memory)
- when strict is set to false, the matrix will use the auxiliary memory until a size change
- when strict is set to true, the matrix will be bound to the auxiliary memory for its lifetime; the number of elements in the matrix can't be changed
- the default setting of strict in versions 6.000+ is false
- the default setting of strict in versions 5.600 and earlier is true
关于c++ - 从 C 数组(主要列)转换为 Armadillo 矩阵(arma::mat)而不复制，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/34784242/