[R] how to allign data

Jim Lemon drj|m|emon @end|ng |rom gm@||@com
Fri Aug 3 00:32:18 CEST 2018

Hi Petr,
I recently had to align the minima of deceleration events to form an
aggregate "braking profile" for different locations. It seems as
though you are looking for something like:

find_increase<-function(x,surround=10) {
 nneg<-sum(indices < 1)
 # pad both ends with NA if needed
 if(nneg > 0) newx<-c(rep(NA,nneg),newx)


On Thu, Aug 2, 2018 at 10:23 PM, PIKAL Petr <petr.pikal using precheza.cz> wrote:
> Dear all
> Before I start to reinvent wheel I would like to ask you if you have some easy solution for aligning data
> I have something like this
> x<-1:100
> set.seed(42)
> y1<-c(runif(20)+1, 1.2*x[1:80]+runif(80))
> y2<-c(runif(40)+1, 1.2*x[1:60]+runif(60))
> plot(x,y1)
> points(x,y2, col=2)
> with y increase starting at various x.
> I would like to allign data so that the increase starts at the same x point, something like
> plot(x,y1)
> points(x[-(1:20)]-20,y2[-(1:20)], col=2)
> I consider using strucchange or segmented packages to find break(s) and "shift" x values according to this break. But maybe somebody already did similar task (aligning several vectors according to some common breakpoint) and could offer better or simpler solution.
> Best regards.
> Petr
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