r - Computing histogram of particular column variable in R

Question

So I'm interested in making a histogram of values just for the "NV" variable (the column contains either "NV" or "VV".) How can I extract just these particular values?

标签： rhistogram

Answer 1

由于您没有提供可重现的示例：

虚拟数据

df <- data.frame(id=c(rep("NV",15),rep("VV",15)),value=sample(x = 1:100,size = 30,replace = TRUE))

通过对所需值进行子集化来创建直方图

hist(df[df$id=="NV",]$value)

或者

hist(df[df$id=="NV",2])