找到所有周圍細胞的平均值

Question

給定矩陣[1 2 3; 4 5 6; 7 8 9; 10 11 12]，我怎麼能通過每個元素，並找到它周圍的所有細胞的平均值？

Answer 1

你應該這樣做。

// considering matrix[size][size] as input 
int i,j,i_avg,j_avg; 
int sum,count; 
int average[size][size]; // the average array 

for(i=0;i<size;i++) 
{ 
    for(j=0;j<size;j++) 
    { 
     sum=0; 
     count=0; 
     for(i_avg=-1;i<=1;i++) 
     { 
      if(i+i_avg<0 || i+i_avg>=size) 
       continue; 
      for(j_avg=-1;j<=1;j++) 
      { 
       if(j+j_avg<0 || j+j_avg>=size) 
        continue; 
       sum+=matrix[i+i_avg][j+j_avg]; 
       count++; 
      } 
     } 
     average[i][j]=sum/count; // average of the surrounding elements of matrix[i][j] 
    } 
}