list 从列表转换为数字
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Convert from list to numeric
提问by Tim
Hi I've had a look at a lot of other qns/answers and haven't been able to resolve coercing from list form to numeric form. If it is of use, the list is originally drawn from a factor (and is 1x33 rows).
嗨，我看过很多其他的 qns/答案，但无法解决从列表形式到数字形式的强制转换问题。如果它有用，该列表最初是从一个因子中提取的（并且是 1x33 行）。
My list is defined by:
我的列表定义为：
tmpseqsf[[1]]
which provides:
它提供：
TradeValue
1 72914431
2 25325
3 20139
4 ...
So based on other advice (Stackoverflow, etc) I use:
因此，根据其他建议（Stackoverflow 等），我使用：
tmpx <-as.numeric(tmpseqsf[[1]])
but I get the error:
但我收到错误：
Error: (list) object cannot be coerced to type 'double'
And just confirming nothing has happened:
只是确认没有发生任何事情：
is.numeric(tmpseqsf[[1]])
[1] FALSE
Is there something I am completely missing?
有什么我完全想念的吗？
回答by ahly
If the values are of type factor, then you should convert them by as.numeric(as.character(unlist(tmpseqsf[[1]])))
如果值是因子类型，那么您应该将它们转换为 as.numeric(as.character(unlist(tmpseqsf[[1]])))
