April 2014
Beginner to intermediate
830 pages
15h 21m
Chinese
Content preview from Mathematica 錦囊妙計
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15.8 使用 DynamicModule 指令設置臨時變數以平衡速度與記憶體空間
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611
15.8 使用 DynamicModule 指令設置臨時變數以
平衡速度與記憶體空間
問題點
你 想 使 用 動 態 單 元 中 的 暫 存 資 料 以 避 免 重 複 運 算， 但 又 不 想 因 此 建 立 過 於 膨 脹 的
notebook 檔案。[Page-613]
解決方案
使用
DynamicModule
指令中的
UnsavedVariables
選項，它用來宣告將哪些暫存變數保
留於前端介面中，而不必儲存至 notebook 檔案；並使用
DynamicWrapper
指令確保暫存
資料將從動態表示式運算得出。以下範例中，
plotPoints
變數並不需儲存於 notebook
檔案中， 儲 存初始 座標的 位置就 足夠了，只 有在需繪 出右側 兩張圖 形時，才會 運算
plotPoints
變數值。
ch15.indd 611 2014/4/7 下午 01:14:14
612
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第十五章
討論說明
以下 是 我最 初設 計的 程 式， 其 中並 未使 用
DynamicWrapper
指令， 而似 乎 也行 得通，
但 Wolfram 的 Theodore Gray 提 到， 這 將 可 能 導 致 Math ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.