这个函数是自己定义用来计算学习曲线累积指数的:
Public Function sumlearn(factor, units)
' factor: learning percentage, 输入值
' units: total units 输入值
i = 1
x = 0
Do While i <= units
x = x + factor ^ (Log(i) / Log(2))
i = i + 1
Loop
sumlearn = x '输出
End Function
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