r - Predefine the factors in table function in R

Question

I would like to predefine the levels of the table function to make the results comparable among distinct datasets. Let's say that I would like to compare obj1 and obj2:

obj1 <-c(1,1,1,2,3)

obj2 <- c(1,1,1,2,2)

If I use table function on them the results have different factors:

> table(obj1)
obj1
1 2 3
3 1 1
> table(obj2)
obj2
1 2
3 2

I tried to predefine the levels without success:

table(obj2, deparse.level = 3)

Error in vapply(l[fixup], function(x) switch(deparse.level + 1, "", if (is.symbol(x)) as.character(x) else "", : values must be length 1, but FUN(X[[1]]) result is length 0

Any ideas?

Answer 1

现在，你只有数字。如果您制作 obj 的因子，则可以声明因子级别。

obj1 <- factor(c(1,1,1,2,3), levels=1:3)
obj2 <- factor(c(1,1,1,2,2), levels=1:3)
table(obj1)
obj1
1 2 3 
3 1 1 
table(obj2)
obj2
1 2 3 
3 2 0