我正在開發的程序旨在處理大量的數據並生成至少2^34個布爾數據。這些靜態生成的數據在整個程序運行過程中被清除(只有一部分在每個實例中被排序),並且最後將最少2^21行統計數據的向量傳遞到最後階段以供進一步處理。C++ STL矢量分類 - 破壞和清零
但是,某些輸入數據的STL排序失敗。排序完成其處理後,某些矢量行將被清零或損壞。我似乎唯一的選擇是嘗試對混合Quicksort/Insertion排序算法進行硬編碼。
我很感激你是否投射你的想法。乾杯。數據的最後階段
數據結構:
struct statisticalValues{
unsigned long long id; //index id
unsigned int col_Sum; //Sum: total number of 1s for each combination
unsigned int col_Relevancy; //Relevancy = total number of 1s produced by (Comb AND Rel)
float col_Sensitivity; //Sensitivity= Relevancy/X
float col_Precision; //Precision= Relevancy/Sum
};
extern vector<statisticalValues> statistics;
調用STL排序:
sort(statistics.begin(), statistics.end(), BySensitivity());
比較標準:
#define EPSILON 0.0001 // user-defined tolerance for equality of floating-point numbers
struct BySensitivity {
bool operator()(statisticalValues const &a, statisticalValues const &b) const {
float sensitivityDif = b.col_Sensitivity - a.col_Sensitivity;
if((sensitivityDif < EPSILON) && (sensitivityDif > -EPSILON)){
return ((b.col_Precision - a.col_Precision) < EPSILON);
}else{
return (sensitivityDif < -EPSILON);
}
}
};
樣品的行將被破壞的數據(即, N無特定的順序):
id,col_Sum,col_Relevancy,col_Sensitivity,col_Precision
1568676,5353,3696,94.166,69.045
1770228,5353,3696,94.166,69.045
2040533,5353,3696,94.166,69.045
2053376,5353,3696,94.166,69.045
1231712,4668,3425,87.261,73.372
1946656,4668,3425,87.261,73.372
1948021,4668,3425,87.261,73.372
破壞&通過STL排序歸零後:
比較標準::
id,col_Sensitivity,col_Precision
10540996614775448722,5.8399e-34,5.8399e-34
8589934369,0.0000,0.0000
0,0.0000,0.0000
0,0.0000,0.0000
0,0.0000,0.0000
0,0.0000,0.0000
0,0.0000,0.0000
實施建議的修改後
struct BySensitivity {
bool operator()(statisticalValues const &a, statisticalValues const &b) const {
float sensitivityDif = b.col_Sensitivity - a.col_Sensitivity;
if((sensitivityDif <= EPSILON) && (sensitivityDif >= -EPSILON)){
return ((b.col_Precision - a.col_Precision) < -EPSILON);
}else{
return (sensitivityDif < -EPSILON);
}
}
};
Thnaks到@馬克-B,@btilly,@大衛-索恩利,@sth & @丹尼爾 - 加拉格爾
在哪裏是否創建了矢量,以及它是如何在你的程序中傳遞的? – sth 2011-02-03 19:10:01
當你使用`stable_sort`的時候你會得到腐敗嗎? – 2011-02-03 19:12:18
絕對沒有代碼顯示使用單詞`vector`,請顯示`statistics`的定義和如何添加一些樣本值然後顯示如何打印結果我們可以幫助t母雞。 – 2011-02-03 19:16:42