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@ -285,7 +285,7 @@ while (a > 4) {
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}
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# 记住,在 R 语言中 for / while 循环都很慢
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# 建议使用 apply()(我们一会介绍)来错做一串数据(比如一列或者一行数据)
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# 建议使用 apply()(我们一会介绍)来操作一串数据(比如一列或者一行数据)
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# IF/ELSE
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