将data.frame对象直接转换为R中的列联表

Question

假设我导入了外部数据,这是一个列联表,如下所示:

var_names <-c("School", "Coffeeshop", "Hospitals", "Parks") 
Washington <- c(142, 120, 20, 20)
Seattle<-c(120, 140, 30, 40)
ctable <- data.frame(rbind(Washington, Seattle))
colnames(ctable) <- var_names
ctable

           School Coffeeshop Hospitals Parks
Washington    142       120        20    20
Seattle       120       140        30    40

现在ctable是'data.frame',如何在R中将其类转换为'table'？谢谢!

Answer 1

首先将其转换为矩阵(数组):

class(as.table(as.matrix(ctable)))
[1] "table"