Question

最近我一直试图编写一个神经网络程序。我将所有神经元连接存储在神经元的矢量中。然而，每当我将连接推回向量时，它似乎都没有存储（我可以通过调试模式告诉），当我尝试在for循环中添加向量的激活值时，我得到一个out_of_range错误。这是我的代码。

Main.cpp的

#include <iostream>
#include "neuron.h"

void displayboard(bool board [8][8]);

using namespace std;

int main()
{
    int id = 2;
    int inputids [] = {3};
    int outputids [] = {4};
    int inputweights [] = {5};
    bool new_neuron = true;
    neuron test (inputids, outputids, inputweights, new_neuron, id);
    test.connections.at(0).value = 6;
    // here is where the error is returned
    test.activation();
    cout << test.activationnumber;
    return 0;
}

这里是Neuron.cpp：

#include "neuron.h"
#include <vector>
#include <random>
#include <ctime>

using namespace std;

neuron::neuron(int inputids [], int outputids [], int inputweights [], 
    bool new_neuron, int id)
{
    this->id = id;
    if (new_neuron==true) {
        srand (time(0));
        connection tempconnection;
        for (int i = 0; i <=(sizeof (inputids)/sizeof (inputids [0])); i++)            
        {
            tempconnection.type=false;
            tempconnection.tofrom = inputids [i];
            tempconnection.weight = rand ();
            this->connections.push_back (tempconnection);
        }
    // this continues on for other options
}

void neuron::activation (){
    for (int i=0; i<=this->connections.size (); i++) {
        this->activationnumber += ((this->connections.at(i).value)
            *(this->connections.at (i).weight));
    }
}

Answer 1

更新：阅读this将帮助您了解为什么您的“sizeof / sizeof”方法在C ++中效果不佳。

原始回答

items的行为可能不符合您的预期。以下代码输出2，但您似乎期望4.对堆栈中的对象使用array，对堆中的对象使用vector。

if (toPaste !== -1) { // meaning its children were indeed rearranged

  // inform Polymer of the change
  var tempPaste = toPaste;
  for (var i = toRearr.length - 1; i >= 0; i--) { // start from end to preserve order

    // we're moving an item to the right of our 'paste' index, so decrease
    // tempPaste by 1 so it stays consistent
    if (tempPaste > toRearr[i]) tempPaste--;

    // move element from old index to new index, using two array splices
    // that essentially remove and reinsert the element in the array
    target.splice('items', tempPaste, 0, target.splice('items', toRearr[i], 1)[0]);
  }
}

更改

sizeof(array)/sizeof(array[0])

到

#include <iostream>
using namespace std;

void foo( int array[] )
{
    wcout << sizeof( array ) / sizeof( array[ 0 ] );
}

int main()
{
    int test[ 4 ];
    foo( test );
    return 0;
}

同时更改

int inputids [] = {3};
int outputids [] = {4};

到

vector< int > {3};
vector< int > {4};

Vector :: push_back不在向量中存储值

1 个答案: