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问题描述
我在R中有一个大约10,000个元素的列表.假设我只选择5、7和9个元素.我不确定如果没有for循环该怎么做.
I have a list in R some 10,000 elements long. Say I want to select only elements, 5, 7, and 9. I'm not sure how I would do that without a for loop.
我想做类似mylist[[c(5,7,9]]的操作，但这不起作用.我也尝试过lapply函数，但也无法使其正常工作.
I want to do something like mylist[[c(5,7,9]] but that doesn't work. I've also tried the lapply function but haven't been able to get that working either.
推荐答案
mylist[c(5,7,9)]应该这样做.
您希望将子列表作为结果列表的子列表返回；您不必为此使用[[]](或者功能是[[)，就像Dason在评论中提到的那样，[[会抓取元素.
You want the sublists returned as sublists of the result list; you don't use [[]] (or rather, the function is [[) for that -- as Dason mentions in comments, [[ grabs the element.
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