本文介绍了Excel /数学运算/ DataTable行上的表达式的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
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Expression for Sigma and CpK
Input
DataTable1 --- table1
|Parameter Name| Lower |Upper |point90 |point10 |point50 |
Diff_IC[1] | 1.5 |2.5 |0.1471839 |0.137499005 |0.141139999 |
Prog_IC[2] |-10 |10000000|0.148519993 |0.137592003 |0.141236007 |
Nam_IC[3] |-64 |64 |0.157493005 |0.117183459 |0.141788006|
ADCI_N[1 ] |-0.8 |-0.1 |0.138519993 | 0.117592003|0.142398 |
Output
|Parameter Name| Lower |Upper |point 90 |point10 |point50 |Sigma |CpK |
Diff_IC[1] | 1.5 |2.5 |0.147183999 |0.137499005|0.141139999 | | |
Prog_IC[2] |-10 |10000000 |0.148519993 |0.137592003 |0.141236007| | |
Nam_IC[3] |-64 |64 |0.157493005 |0.117183459|0.141788006| | |
ADCI_N[1 ] |-0.8 | -0.1 |0.138519993 |0.117592003 |0.142398 | | |
Formula:
Sigma = (P90 point-P10 point)/2.56
Cpk = Minimum|[ (P50 point - Lower) / 3 (sigma), (upper - P50 pint) / 3 (sigma)]|
推荐答案
DataTable dtDemo = new DataTable();
dtDemo.columns["Sigma"].readonly = false;
for(int i =0 ; i < dtDemo.rows.count; i++)
{
dtColumns.rows[i]["Sigma"] = Convert.ToDouble(dtColumns.rows[i]["Upper"]) - Convert.ToDouble(dtColumns.rows[i]["Lower"]);
// here i just given one demo u need to change as per your requirement
}
DataColumn sigma = table1.Columns.Add("Sigma", typeof(double));
DataColumn cpKL = table1.Columns.Add("CpKL", typeof(double));
DataColumn cpKR = table1.Columns.Add("CpKR", typeof(double));
DataColumn cpK = table1.Columns.Add("CpK", typeof(double));
sigma.Expression="(Convert(point90,'System.Double')-Convert(point10,'System.Double'))/2.56";
cpKL.Expression="(Convert(point50,'System.Double')-Convert(LSL,'System.Double'))/(3.0*sigma)";
cpKR.Expression="(Convert(USL,'System.Double')-Convert(point50,'System.Double'))/(3.0*sigma)";
cpK.Expression = "IIF(cpKL < cpKR, cpKL, cpKR)";
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