Thread: map of name/vector<float> access?

I am declaring a type as
typdef std::map<string,std::vector<float>> StringFloatsMap

its purpose is to hold a name and vector of multiple values, which I will use to determine the sum , mean for each name and for all names and values.

my question is how to access individul vector values in the map would it be :
name_values[name_key][vector_index]=value;

my second question:
Since I will not be keeping track of the number of values per name, I want to create an iterator to each vector to step through the values for calculation of sum and mean for each name here is kind of what I had in mind.
// name_key_index is iterator to map
vector::iterator value_index = name_value[name_key_index->first].begin();

how would I do this properly and can I use the iterator in float division ie
mean=sum/value_index;

I don't think my approach is going to work. After struggling for the last hour to get insertion right I have to change my initial conception of the data structure.

From what I have been reading you must insert key, value pairs in a map and if the key already exists it will return an error upon an attempt to insert.

I have made an attempt at getting an iterator the element at key name so that I could use the second element of the iterator which should be a vector and push the value onto it. Here is a code snippet

Code:

#include <iostream>
#include <string>
#include <map>
#include <vector>
using namespace std;


int main()
{
  typedef vector<float> FltVect;
  typedef map< string, FltVect > StringFloatsMap;

  StringFloatsMap name_value;
 
  // Give instructions:
  cout << "Enter a sequence of name value pairs (seperated by a space)."<<endl;
  cout << "Enter: END value to stop input and calculate sums and means."<<endl;
  cout << endl;

  string name_key;
  float temp_value;
  float sum_all_values;
  int count_values;
  
  cout << "Enter name value:";
  cin >> name_key >> temp_value;
  cout << endl;

  StringFloatsMap::iterator name_key_index;

  while (name_key != "END"){
    name_value.insert(name_key);    
    name_key_index=name_value.find(name_key);
    name_key_index->second.push_back(temp_value);
        
    sum_all_values += temp_value;
    ++count_values;
    
    cout << "Enter name value:";
    cin >> name_key >> temp_value;
    cout << endl;
  }

Any suggestions on this idea which isn't working.

Solved the problem by simply:
name_value[name_key].push_back(temp_value);
which will push onto the back of the value and or insert the name.