将2D向量转换为2D数组 [英] Converting 2D vector to 2D array

问题描述

自从我上次访问数组以来已经有一段时间了(最近我一直在使用向量)，由于我使用的库，我需要将2D向量转换回2D数组，因为我接受类型为的参数double数组，其中该数组的访问者例如是 foo [i] [j] .

It's been a while since I last visited arrays (I've been working with vectors recently) and I need to convert an 2D vector back into a 2D array because of a library I am using accepts the paramaters of type double array where the accessors of this array is foo[i][j] for example.

这是我的代码:

double** setupHMM(vector<vector<double> > &vals, int N, int M)
{
  double** temp;
  temp = new double[N][M];

 for(unsigned i=0; (i < N); i++)
 {
    for(unsigned j=0; (j < M); j++)
    {
        temp[i][j] = vals[i][j];
    }
 }
}

因此，我得到错误:'M'不能出现在常量表达式中

我也尝试了以下方法:

double** setupHMM(vector<vector<double> > &vals, int N, int M)
{
   double** temp;

   for(unsigned i=0; (i < N); i++)
   { 
      temp[i] = new double[N];
      for(unsigned j=0; (j < M); j++)
      {
          temp[j] = new double[M];
          temp[i][j] = vals[i][j];
      } 
   }
 }

但是，这会产生分段错误11.

However, this produces a segmentation fault 11.

任何人都可以提出任何建议，还是将向量转换为2D数组的更好方法.

Could anyone suggest any advice, or, a better way to convert a vector to a 2D array..

谢谢

推荐答案

您已经关闭.应该是:

double** setupHMM(vector<vector<double> > &vals, int N, int M)
{
   double** temp;
   temp = new double*[N];
   for(unsigned i=0; (i < N); i++)
   { 
      temp[i] = new double[M];
      for(unsigned j=0; (j < M); j++)
      {
          temp[i][j] = vals[i][j];
      } 
   }
 }

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