1.str_c （stringr中的函数）
合并多个向量为一个字符向量
str_c(..., sep = "", collapse = NULL) ###sep为间隔符号
例：f<-str_c(c(1:10),"%")
f
"1%" "2%" "3%" "4%" "5%" "6%" "7%" "8%" "9%" "10%"
2.cut
mycut = c(-1,10, 20, 30, 40, 50, 60, 70, 80, 90, 101)
cut153<-cut(freqC_153, mycut, labels = f) ###cut(vector, 自定义分组, labels:分组名称)
3.length(x)
x的长度/元素数目
4.data.frame(......) 向量转换为数据框
mydrawdata153 <- data.frame(f, ratio153)
5.levels 调整因子顺序
type<-factor(c("D", "I", "S", "C"),
levels = c("D", "I", "S", "C"))
###不加会自动按照C, D, I, S 排序
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