[R] Counting value changes

[jim holtman]

try this:

> x <- c(0,1,0,1,0,0,0,0)
> sum(diff(x) == 1)
[1] 2


On Sat, Feb 18, 2012 at 2:51 PM, Pete Brecknock <Peter.Brecknock at bp.com> wrote:
>
> maris478 wrote
>>
>> Good afternoon,
>> I've encountered a little bit of a problem, would appreciate any help
>> here.
>>
>> I made a small vector consisting of ones and zeros.
>> Something like this x <- c(0,1,0,1,0,0,1,0), and all I need is to count
>> how many times "0" becomes "1".
>> Tried various, of what I thought, methods with built in functions. Didn't
>> get any further.
>>
>> Thank you very much.
>>
>
> How about ...
>
> x <- c(0,1,0,1,0,0,0,0)
>
> sum(rle(x)$values)
>
> HTH
>
> Pete
>
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-- 
Jim Holtman
Data Munger Guru

What is the problem that you are trying to solve?
Tell me what you want to do, not how you want to do it.