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關於math.sqrt c# 在 [問題] 同樣數據,讓c#和excel算標準差- 看板C_Sharp 的評價
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關於math.sqrt c# 在 c# - Generic Integer Square Root 的評價

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math.sqrt c# 在 [問題] 同樣數據,讓c#和excel算標準差- 看板C_Sharp 的推薦與評價

作者liaommx (Orz)

看板C_Sharp

標題[問題] 同樣數據,讓c#和excel算標準差

時間Wed Jun 17 00:28:51 2009

excel算
14.08530558

csharp算出來

14.227170173088554

這是正常嗎?_?

PS:excel只有小數8位
csharp double可以到小數下16位.

--

※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 118.169.187.142

→ james732:你要不要說說你是算了什麼…？ 06/17 01:32

推 windsheep:check一下兩個算法是不是一樣..分母? 06/17 06:34

→ Steven0422:公式有一樣嗎? 06/17 08:19

→ liaommx:公式是一樣的,只是計算能力不同... 06/17 10:14

公式程式碼如下
我總共有97個資料,所以97是這樣來的.

public double StandardDeviation(double[] num)
{
double avg = Average(num);

double SumOfSqrs = 0.0;

foreach (double d in num)
{
SumOfSqrs += Math.Pow(d - avg, 2);
}

//return Math.Sqrt((SumOfSqrs / (num.Length)));
return Math.Sqrt((SumOfSqrs / (97)));
}

public double Average(double[] num)
{
double sum = 0.0;

foreach (double d in num)
{
sum += d;
}

//return sum / Convert.ToDouble(num.Length);
return sum / Convert.ToDouble(97);
}
※ 編輯: liaommx 來自: 120.125.83.171 (06/17 10:16)

→ liaommx:PS:excel用的是stdev算標準差 06/17 10:30

→ cjcat2266:Excel stdev使用的公式確定完全一樣嗎? 06/17 11:30

推 hulapig:查了一下，Excel用的公式不一樣喔，stdev是除以n-1 06/18 09:15

→ hulapig:stdevp才是除以N 06/18 09:15

... <看更多>

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math.sqrt c# 在【Visual C#】(#7/#99) - 範例/ 解一元二次方程式的根 - YouTube 的推薦與評價

【Visual C# 】(#7/#99) - 範例/ 解一元二次方程式的根| 前景顏色ForeColor、文字靠邊TextAlign、 Math. Sqrt ()、Math.Round(). 487 views · 10 months ... ... <看更多>

math.sqrt c# 在 sqrt · GitHub Topics 的推薦與評價

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取得本站獨家住宿推薦15%OFF 訂房優惠. 取得優惠 · c++平方怎麼打 python開根號 c開根號不用 sqrt Mathf 開根號 vba開根號 . ... · C# 开根号函数： math.pow()函数· c# 开根号 ...

#96. sqrt() - C函數- C語言標準庫 - 極客書

聲明下麵是函數sqrt()聲明。 double sqrt ( double x ) 參數x-- 這是浮點值。返回值這個函數返回x的平方根。例子下麵的例子演示了如何使用sqrt ... <math.h> - C語言標準庫< ...

#97. Java Program to Find Square Root of a Number Without ...

In Java, to find the square root of a number is very easy if we are using the pre-defined method. Java Math class provides sqrt() method to find the square root ...

#98. 如何使用C#编写聚类分析算法

Count; i++) { sumSquaredDifferences += Math.Pow(PointA[i] - PointB[i], 2); } return Math.Sqrt(sumSquaredDifferences); } private List<double> ...

#99. 5sqrt 3

Solve your math problems using our free math solver with step-by-step solutions. ... Simplify the radical expression sqrt 56x^2 28x 2x sqrt 14*** 2x sqrt 7 sqrt ...