April 2014
Beginner to intermediate
830 pages
15h 21m
Chinese
Content preview from Mathematica 錦囊妙計
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606
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第十五章
以下範例使用三個滑桿分別代表電壓、電流與電阻，且變數間將遵守歐姆定律（電壓 =
電流 * 電阻）。電壓滑桿的值會是電流與電阻的乘積，然而當電壓值被改變時，電流值
需重新計算。而當電阻值很小時，增加電壓值可能會導致電流值過大而超出滑桿上限，
解決方法是將滑桿的極限值動態化，這需要使用
Dynamic
將整個滑桿包裝起來，但我們
並不希望整個互動元件在滑桿變動值持續重新生成，此時便輪到終止函數上場了，只有
在滑桿變動結束時，其他滑桿的極限值才會被重新指派，並生成新的滑桿。[Page-608]
互動式操控電流值，並計算電壓值
終止函數將更新電壓與電阻值之上限
互動式操控電阻值，並計算電壓值
終止函數將更新電流與電壓值之上限
ch15.indd 606 2014/4/2 下午 03:39:58
15.6 控制動態變數的更新時機
|
607
互動式操控電壓值，並計算電流值
終止函數將更新電流與電阻之上限
延伸資訊
歐姆定律範例中，使用
DynamicModule
的原因請參見訣竅 15.7。[Page-609]
15.6 控制動態變數的更新時機
問題點
你想控制動態變數的更新時機與變數相關性。
解決方案
使用
Refresh
指令控制動態更新的時機。以下動態表示式將每秒鐘更新亂數。
ch15.indd 607 2014/4/2 ...
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