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- using System;
- using System.Collections.Generic;
- using System.Linq;
- using System.Text;
- using System.Threading.Tasks;
- namespace ProjectBase.Util
- {
- public class CpkPro
- {
- private static float StDev(float[] arrData) //计算标准偏差
- {
- float xSum = 0F;
- float xAvg = 0F;
- float sSum = 0F;
- float tmpStDev = 0F;
- int arrNum = arrData.Length;
- for (int i = 0; i < arrNum; i++)
- {
- xSum += arrData[i];
- }
- xAvg = xSum / arrNum;
- for (int j = 0; j < arrNum; j++)
- {
- sSum += ((arrData[j] - xAvg) * (arrData[j] - xAvg));
- }
- tmpStDev = Convert.ToSingle(Math.Sqrt((sSum / (arrNum - 1))).ToString());
- return tmpStDev;
- }
- private static float Cp(float UpperLimit, float LowerLimit, float StDev)//计算cp
- {
- float tmpV = 0F;
- tmpV = UpperLimit - LowerLimit;
- return Math.Abs(tmpV / (6 * StDev));
- }
- private static float Avage(float[] arrData) //计算平均值
- {
- float tmpSum = 0F;
- for (int i = 0; i < arrData.Length; i++)
- {
- tmpSum += arrData[i];
- }
- return tmpSum / arrData.Length;
- }
- private static float Max(float[] arrData) //计算最大值
- {
- float tmpMax = 0;
- for (int i = 0; i < arrData.Length; i++)
- {
- if (tmpMax < arrData[i])
- {
- tmpMax = arrData[i];
- }
- }
- return tmpMax;
- }
- private static float Min(float[] arrData) //计算最小值
- {
- float tmpMin = arrData[0];
- for (int i = 1; i < arrData.Length; i++)
- {
- if (tmpMin > arrData[i])
- {
- tmpMin = arrData[i];
- }
- }
- return tmpMin;
- }
- private static float CpkU(float UpperLimit, float Avage, float StDev)//计算CpkU
- {
- float tmpV = 0F;
- tmpV = UpperLimit - Avage;
- return tmpV / (3 * StDev);
- }
- private static float CpkL(float LowerLimit, float Avage, float StDev) //计算CpkL
- {
- float tmpV = 0F;
- tmpV = Avage - LowerLimit;
- return tmpV / (3 * StDev);
- }
- private static float Cpk(float CpkU, float CpkL) //计算Cpk
- {
- return Math.Abs(Math.Min(CpkU, CpkL));
- }
- public static float getR_value(float[] k_valuesTOO)
- {
- float min = k_valuesTOO[0];
- float max = k_valuesTOO[0];
- for (int i = 0; i < k_valuesTOO.Length; i++)
- {
- if (k_valuesTOO[i] < min)
- {
- min = k_valuesTOO[i];
- }
- if (k_valuesTOO[i] > max)
- {
- max = k_valuesTOO[i];
- }
- }
- return max - min;
- }
- public static float getCPK(float[] k, float UpperLimit, float LowerLimit) //获取CPK值
- {
- if (k.Length <= 1 || UpperLimit <= LowerLimit)
- {
- return -1;
- }
- float cpk = Cpk(CpkU(UpperLimit, Avage(k), StDev(k)), CpkL(LowerLimit, Avage(k), StDev(k)));
- return cpk;
- }
- }
- }
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