r语言中，with，which用法的问题，急需帮助

Python015

r语言中，with，which用法的问题，急需帮助,第1张

这个是which(item.x==101))，不是which(item==101))吧

还有which(b%in%item.x))

一开始有item.x这一列元素的，后面怎么都是item了呀？

你能把信息再补充多一点吗？譬如把 m 给出来看一下。

==符号操作时会先将短向量的长度延长成和长向量的长度一样长，如

a<-c("一","二","三","四","五")

长度为5，而

c("一","四")

会被延长为

c("一","四","一","四","一")

产生了截断，所以会警告：长的对象长度不是短的对象长度的整倍数。

你拿c("一","二","三","四","五")和c("一","四","一","四","一")比较，相同的是1,4

而如果是c("一","三")，会延长成c("一","三","一","三","一")，并有警告产生

你拿c("一","二","三","四","五")和c("一","三","一","三","一")比较，相同的是1