c++ - How to convert a 3D vector to a cv::Mat -

i trying fill opencv mat (float) 3d vector of floats (vgraph1). however, resulting opencv mat (test) not correctly filled, i.e. first column filled correct values while rest junk values (-4.32e+08). confirmed error writting mat text file. doing wrong? kindly advice. thanks.

int nstates = 9; const int rows = 10; const int cols = 10; vector < vector < vector<float> > > vgraph1;  for(int iii = 0; iii < rows; iii++){      vgraph1.push_back(vector<vector<float> >());      for(int jjj = 0; jjj < cols; jjj++){          vgraph1[iii].push_back(vector<float>());          for(int kkk = 0; kkk < nstates; kkk++){               vgraph1[iii][jjj].push_back(rand());              cout <<  vgraph1[iii][jjj][kkk] << " ";          }          cout << endl;       }   }  cout << "opencv mat \n" << endl;  mat test(rows, cols, cv_make_type(cv_32f, nstates));  for(int iii = 0; iii < rows; iii++){      float *ptest = test.ptr<float>(iii);      for( int jjj = 0; jjj < cols; jjj++){          (int kkk = 0; kkk < nstates; kkk++){              ptest[kkk] = vgraph1[iii][jjj][kkk];              cout << ptest[kkk] << " ";          }          cout << endl;      }   }  filestorage save("mat.txt", filestorage::write);  save << "node" << test;  save.release(); 

i manage following working solution; hope correct?

int nstates = 9; const int rows = 10; const int cols = 10; vector < vector < vector<float> > > vgraph1;  for(int iii = 0; iii < rows; iii++){      vgraph1.push_back(vector<vector<float> >());      for(int jjj = 0; jjj < cols; jjj++){          vgraph1[iii].push_back(vector<float>());          for(int kkk = 0; kkk < nstates; kkk++){               vgraph1[iii][jjj].push_back(rand());              cout <<  vgraph1[iii][jjj][kkk] << " ";          }          cout << endl;       }   }  cout << "opencv mat \n" << endl;  mat test(rows, cols, cv_make_type(cv_32f, nstates));  for(int iii = 0; iii < rows; iii++){      float *ptest = test.ptr<float>(iii);      for( int jjj = 0; jjj < cols; jjj++){          (int kkk = 0; kkk < nstates; kkk++){              ptest[nstates*jjj + kkk] = vgraph1[iii][jjj][kkk];              cout << ptest[nstates*jjj+kkk] << " ";          }          cout << endl;      }   }   filestorage save("mat.txt", filestorage::write);  save << "node" << test;  save.release();