R table() 函数； 如何获取列名？

Question

Say I have a dataframe with df$Cat, df$IsYellow. Both columns can either be "Yes" or "No"

How do I generate the 2x2 table and also have Cat and IsYellow printed on the table so that I know which side of the table belongs to Cat and which side belongs to IsYellow?

Answer 1

df <- data.frame(Cat=sample(c('Yes', 'No'), size=10, replace=TRUE),
                 IsYellow=sample(c('Yes', 'No'), size=10, replace=TRUE))
table(df)
##      IsYellow
## Cat   No Yes
##   No   3   1
##   Yes  2   4