C ++ 2D向量和操作 [英] C++ 2D vector and operations

问题描述

如何在C ++中创建 2D向量并找到 length 和 ？

How can one create a 2D vector in C++ and find its length and coordinates?

在这种情况下，向量元素如何填充值？

In this case, how are the vector elements filled with values?

谢谢。

推荐答案

如果您的目标是进行矩阵计算，请使用 Boost :: uBLAS 。这个库有很多线性代数函数，并且可能比手工创建的任何东西快很多。

If your goal is to do matrix computations, use Boost::uBLAS. This library has many linear algebra functions and will probably be a lot faster than anything you build by hand.

如果你是一个受虐狂者，想要坚持使用 std :: vector ，您需要执行以下操作：

If you are a masochist and want to stick with std::vector, you'll need to do something like the following:

std::vector<std::vector<double> > matrix;
matrix.resize(10);
matrix[0].resize(20);
// etc

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