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並前往https://www.quora.com/In-R-if-you-wanted-to-find-the-indices-row-numbers-for-observations-that-meet-a-particular-condition-what-might-you-use

In R, if you wanted to find the indices (row numbers ... - Quora

R's array system allows you to use conditional array elements, selecting rows or columns that meet a particular logical constraint. · Assume x is a 100x20 data ...

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