從priority_queue獲取數據后結果顯示-nan

Question

我寫了代碼給struct nngNode賦值，但是當我檢查nngNode里面的結果時，結果顯示-nan。我不知道為什么會出現-nan。在nngNode的結果之前，我可以看到正確的結果來自數組。這是代碼：

1.

struct nngNode{

int x;
int y;
int pixelval;
int pixelnum;
double ndist;
nngNode(int x, int y, int pixelVal,int pixelNum,double ndist) : x(x), y(y), pixelval(pixelval),pixelnum(pixelnum),ndist(ndist) {}

};

struct cmp2{

   bool operator()(nngNode &para1, nngNode &para2) {
        return para1.ndist > para2.ndist;
    }

};

template<class T1>
class Array2D{

public:
        int arows=0;
        int acols=0;
        T1**  __restrict matImg;
Array2D(int rows,int cols,T1 defaultVal):arows(rows),acols(cols){

matImg=new T1*[rows];
for(int i=0;i<rows;i++){
   matImg[i]=new T1[cols];
   memset(matImg[i],defaultVal,sizeof(T1)*cols);
   }
}

T1 &operator()(int m, const int n){

 return matImg[m][n];


 }


T1 *operator()(int k){

 return matImg[k];

}


~Array2D(){

for(int i=0;i<arows;i++){
    delete[] matImg[i];
   }
   delete [] matImg;

 }

};


int ragNode=0;
int pixelSum[id]={0};
int pixelNum[id]={0}


(After calculation the pixelSum and pixelNum have numbers.)
priority_queue<nngNode,vector<nngNode>,cmp2>nngprioq;

Array2D<double> neighDist(id,id,0);
//#pragma omp parallel for reduction(+:ragNode) 
for(int i=0;i<id;i++){
   for(int j=0;j<id;j++){
    if(idArr(i,j)==1&&pixelNum[i]>0&&pixelNum[j]>0){
    ragNode++;
   // double powerDis=((pixelSum[i]/pixelNum[i]-pixelSum[j]/pixelNum[j])/(rows*cols))*((pixelSum[i]/pixelNum[i]-pixelSum[j]/pixelNum[j])/(ros));oll
    double powerDis=pow((((double)pixelSum[i])/(double)pixelNum[i]-((double)pixelSum[j])/(double)pixelNum[j]),2);
    double mulelement=((double)pixelNum[i])*((double)pixelNum[j]);
    double divelement=(double)(pixelNum[i]+pixelNum[j]);
    cout<<"------------------------------------"<<endl;
    cout<<"powerDis:"<<powerDis<<endl;
    cout<<"mulelement:"<<mulelement<<endl;
    cout<<"divelement:"<<divelement<<endl;
    cout<<"("<<i<<","<<j<<")"<<endl;
    cout<<"psum"<<pixelSum[i]<<endl;
    cout<<"pnum"<<pixelNum[i]<<endl;
    cout<<"distance of"<<"("<<i<<","<<j<<"):"<<((mulelement*powerDis)/divelement)<<endl;
    neighDist(i,j)=((mulelement*powerDis)/divelement)+1.0;
    nngNode newnode=nngNode(i,j,pixelSum[i],pixelNum[i],neighDist(i,j));
    nngprioq.push(newnode);

       }
     }
}

這是上面的結果：（只是整個結果的一部分）

------------------------------------
powerDis:0.681595
mulelement:47124
divelement:1711
(240,255)
psum61
pnum28
distance of(240,255):18.7724
------------------------------------
powerDis:0.425937
mulelement:26376
divelement:970
(240,268)
psum61
pnum28
distance of(240,268):11.582
------------------------------------
powerDis:4.33408
mulelement:295656
divelement:1718
(241,170)
psum1055
pnum194
distance of(241,170):745.865
------------------------------------
powerDis:8.18913
mulelement:285374
divelement:1665
(241,201)
psum1055
pnum194
distance of(241,201):1403.58
------------------------------------
powerDis:1.25224
mulelement:295462
divelement:1717
(241,247)
psum1055
pnum194
distance of(241,247):215.487
------------------------------------
powerDis:0.0334138
mulelement:25050
divelement:551
(242,219)
psum129
pnum50
distance of(242,219):1.51908
------------------------------------
powerDis:1.1664
mulelement:100
divelement:52
(242,233)
psum129
pnum50
distance of(242,233):2.24308
------------------------------------
powerDis:1.84341
mulelement:246
divelement:47
(243,251)
psum122
pnum41
distance of(243,251):9.6485
------------------------------------
powerDis:0.00629865
mulelement:46986
divelement:1187
(243,267)
psum122
pnum41
distance of(243,267):0.249325
------------------------------------
powerDis:0.0911844
mulelement:10521
divelement:522
(244,219)
psum44
pnum21
distance of(244,219):1.83784
------------------------------------

這是優先級隊列的 nngNode ode，奇怪的是 pixelSum[i] 中的 pixelval，pixelNum[i] 中的 pixelnum 是 1 和 0。我不明白為什么會出現結果。因為從上面array，ndist，pixelval 和 pixelnum 的數量可以看作是結果。

int ncounter=0;

cout<<"---------------------nng queue---------------------------"<<endl;

while(!nngprioq.empty()){
         cout<<"---------------------------------------------"<<endl;
         cout<<ncounter<<"st Element:"<<endl;
         cout<<"distanceValue:"<<(double)nngprioq.top().ndist<<endl;
         cout<<"x:"<<nngprioq.top().x<<endl;
         cout<<"y:"<<nngprioq.top().y<<endl;
         cout<<"sumPixel:"<<nngprioq.top().pixelval<<endl;
         cout<<"numPixel:"<<nngprioq.top().pixelnum<<endl;
         nngprioq.pop();
         ncounter++;
}

這是使用 -nan 的結果：

x:1
y:6
sumPixel:1
numPixel:0
---------------------------------------------
913st Element:
distanceValue:-nan
x:1
y:0
sumPixel:1
numPixel:0
---------------------------------------------
914st Element:
distanceValue:-nan
x:1
y:4
sumPixel:1
numPixel:0
---------------------------------------------
915st Element:
distanceValue:-nan
x:0
y:26
sumPixel:1
numPixel:0
---------------------------------------------
916st Element:
distanceValue:-nan
x:0
y:11
sumPixel:1
numPixel:0
---------------------------------------------
917st Element:
distanceValue:-nan
x:0
y:20

有人可以提供任何提示或建議嗎？在此先感謝！

Answer 1

感謝所有花時間查看我的問題的人。我發現了關於結構參數和參數名稱的問題。通過將 pixelSum 更改為 pixelsum 並添加 ndist(ndist)。問題已解決。