创建数据框
If your data is captured in several vectors and/or factors, use the data.frame function
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to assemble them into a data frame:> dfrm <- data.frame(v1, v2, v3, f1, f2)
Use as.data.frame instead if your data is captured in a list that contains vectors and/
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or factors:
> dfrm <- as.data.frame(list.of.vectors)
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