溫度

X:K8_3000 CPU Temp.

Y:室外氣溫



設 Y = aX b ,試以線性逼近



8 =18a b

12=20a b



4 = 2a



a=2, b=-28



=> Y = 2X－28 => F(X) = 2X－28



Test:

F(16) = 32－28 = 4

F(17) = 34－28 = 6

. .

. .

. .

F(27) = 54－28 = 26

F(28) = 56－28 = 28

F(29) = 58－28 = 30

F(30) = 60－28 = 32



出現不合理部分,所以X必須有所限制



修正如下: F(X) = 2X－28 (17≦X≦29)



超出[17,29]這個定義域,應該就不能用線性函數來取近似值咯~~