aggregate - Counting in R and preserving the order of occurence -

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suppose have generated vector using following statement:

x1 <- rep(4:1, sample(1:100,4))

now, when try count number of occurrences using following commands

count(x1)   x freq 1 1   40 2 2   57 3 3    3 4 4   46

or

as.data.frame(table(x1))   x1 freq 1  1   40 2  2   57 3  3    3 4  4   46

in both cases, order of occurrence not preserved. want preserve order of occurrence, i.e. output should this

  x1 freq 1  4   46 2  3    3 3  2   57 4  1   40

what cleanest way this? also, there way coerce particular order?

one way convert variable factor , specify desired order levels argument. ?table: "table uses cross-classifying factors build contingency table of counts @ each combination of factor levels"; "it best supply factors rather rely on coercion.". converting factor yourself, in charge on coercion , order set levels.

x1 <- rep(factor(4:1, levels = 4:1), sample(1:100,4))  table(x1) # x1 #  4  3  2  1  #  90 72 11 16

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