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在指定的處理序中,R 是挺好用的有關不產生不必要的複本。Foreach,當然,我們要建立額外的處理,與這些處理序的每個需要它自己的工作的資料複本。如果這些個別的處理程序只需要資料的一部份,您可以最佳化運算所需的資料傳送。(擷取主處理序中的子集合,然後傳遞只有工作者)。但不對,在 foreach() 中的 [.export] 選項不能許多幫。

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