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R Programming : Sort a Vector

Tutorial by:Maria Ghoste      Date: 2016-06-10 03:51:36

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Sorting of vectors can be done using the sort() function. By default, it sorts in ascending order. To sort in descending order we can pass decreasing=TURE. Note that sort is not in-place. This means that the original vector is not effected (sorted). Only a sorted version of it is returned.

> x
[1] 7 1 8 3 2 6 5 2 2 4

> # sort in ascending order
> sort(x)
[1] 1 2 2 2 3 4 5 6 7 8

> # sort in descending order
> sort(x, decreasing=TRUE)
[1] 8 7 6 5 4 3 2 2 2 1

> # vector x remains unaffected
> x
[1] 7 1 8 3 2 6 5 2 2 4

Sometimes we would want the index of the sorted vector instead of the values. In such case we can use the function order().

> order(x)
[1]  2  5  8  9  4 10  7  6  1  3

> order(x, decreasing=TRUE)
[1]  3  1  6  7 10  4  5  8  9  2

> x[order(x)]    # this will also sort x
[1] 1 2 2 2 3 4 5 6 7 

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R Programming

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