[R] moving distance between two sets of data

[White, William Patrick]

Also it occurred to me that my initial explanation was not explicitly clear as to what the desired output is. What I am trying to get is a moving absolute deviation between the two sets of numbers. This is not to be confused with the mean absolute deviation, or the median absolute deviation which are both something different and not what i am after.
________________________________________
From: David Winsemius [dwinsemius at comcast.net]
Sent: Sunday, August 19, 2012 4:03 PM
To: David Winsemius
Cc: White, William Patrick; r-help at r-project.org
Subject: Re: [R] moving distance between two sets of data

On Aug 19, 2012, at 12:58 PM, David Winsemius wrote:

>
> On Aug 19, 2012, at 12:04 PM, White, William Patrick wrote:
>
>> On the surface this seems pretty simple, but I flummoxed. I have
>> two sets of numbers they bounce around zero, positive one and
>> negative one. They have a relationship between them, where one
>> diverges away from the other. I want create a second set of numbers
>> that tracks that divergence.
>>
>> #Lets make some data like mine, kinda
>> Firstset <- runif(100, min = -1 , max =1)
>> Secondset <- runif(100, min = -1 , max =1)
>>
>> #So something like:
>> Divergence <- abs (Firstset - Secondset)
>>
>> #but this doesn't work because when Firstset is at .5 and Secondset
>> is at  -.25 it returns .25 instead of .75
>
>  abs( .5 - (-.25) ) should NOT return .25 so you need to produce a
> better example or point to specifics in the example you offered. If
> what you wanting what you are getting, then use set.seed(123) and
> refer to specific values.
I meant to write:  "If you are not getting what you are wanting .... "
>
> > abs( .5 - (-.25) )
> [1] 0.75
>
> --
> David.
>
>>
>> #another possibility is:
>>
>> Divergence <- abs (Firstset) - abs (Secondset)
>>
>> #but when Firstset is at .5 and Secondset is at -.5 it returns 0
>> instead of 1
>>
>> #It seems like there is a better way to do this. Any ideas?
>> ______________________________________________
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>> https://stat.ethz.ch/mailman/listinfo/r-help
>> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
>> and provide commented, minimal, self-contained, reproducible code.
>
> David Winsemius, MD
> Alameda, CA, USA
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.

David Winsemius, MD
Alameda, CA, USA