如何在2D向量中删除列，C ++ [英] How to delete column in 2d vector, c++

问题描述

如果我在创建矩阵的向量中有一个向量，如何删除该矩阵中的特定列。我已经填充了2d向量，现在我需要一种方法来删除该向量中的特定列，

If i have a vector inside a vector creating a matrix, how do I delete a specific column in that matrix. I have already populated the 2d vector now i need a method to delete a specific column in that vector,

例如，我的向量将如下所示：

for example my vector would look like:

vector<vector<float> > vec;

仅出于了解，我知道如何擦除向量中的行，如下所示：

Just for knowledge i know how to erase the rows in the vector as below:

vec.erase(vec.begin()+row);

//那么删除向量中特定列的算法或代码是什么

// so What is the algorithm or code to delete a specific column in a vector of vector

例如，如果我有

V11, V12, V13
V21, V22, V23
V31, V32, V33

然后我想删除实例列1的特定列将擦除V12，V22，V32并缩小，如下所示：

Then I would like to remove a specific column for instance column 1 which will erase V12, V22, V32 and shrink as below:

V11, V13
V21, V23
V31, V33

感谢您解决此问题。

推荐答案

您需要遍历所有行，并删除每一行中该列中的元素。

You'll need to loop through all the rows, and delete the element in that column in each row.

int columnIndex = 1;
std::for_each(vec.begin(), vec.end(), 
    [&](std::vector<float>& row) {
        row.erase(std::next(row.begin(), columnIndex));
    });

实时演示

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