With Rle from IRanges:

sum(runValue(Rle(diff(gp))) == 1)

On Thu, Aug 5, 2010 at 4:24 AM, ALok <foralok@gmail.com> wrote:

> Hi All
> i have a object
> gp = c(1,2,3,4,21,22,23,24,38,39)
>
> and i want to count number of groups containing consecutive numbers
>
> as
>
> ans should be three as group1 (1,2,3,4), group2 (21,22,23,24) and group3
> contains (38,39)
> any suggestions
>
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