R: converting some levels of a factor to numeric

2018-06-08 05:25:12

I am new to R. I have a factor object with >10000 levels. Most of these levels are numbers which I would like to convert to numeric, but there are several levels that contain descriptions which I do not wish to touch.

Is there a good way for me to isolate the relevant levels of the factor to convert into numeric? Would as.numeric() be a good choice?

Many thanks!

由于我们不能有一个具有多个类的列/向量，因此一个建议是仅将numeric元素进行子集化并使用as.numeric(as.character(将其转换回numeric as.numeric(as.character(

i1 <- grepl("^[0-9.]+$", v1)
v2 <- as.numeric(as.character(v1[i1]))

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