[R] sort by decreasing columns?

[Jeff Newmiller]

In general, different rows would sort in different orders. Your example does not illustrate how you would want to address such a problem. Here I assume you are only interested in sorting by the values in the first row.

dta <- data.frame(a=c(2,3), b=c(3,5), c=c(8,9))
dta[,order(unlist(dta[1,]),decreasing=TRUE)]

Note that data frames don't usually contain data that one would want to manipulate this way... this type of thing would normally be associated with matrices, which always have all elements of a single type.

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On December 13, 2014 4:13:28 PM PST, Nia Gupta via R-help <r-help at r-project.org> wrote:
>Hello, 
>
>I have a data frame that looks like this:
>           a      b    c
>1        2       3    8
>2        3       5    9
>I was wondering if it was possible to reorder the columns by decreasing
>values so the new data frame would look like this:
>           c      b    a
>1        8      3    2
>2        9      5   3
>
>Thank you
>
>
>	[[alternative HTML version deleted]]
>
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