[R] Vectorize tapply(...,cumsum) output

From: Gerrit Draisma <g.draisma_at_erasmusmc.nl>
Date: Wed, 09 Apr 2008 14:53:41 +0200

I would like to graph cumulative counts
and use tapply(...,cumsum) to get
the cumulative counts.
For instance:


    t<-rep(1:4,each=3)    #time
    i<-rep(1:3,times=4)   #categories
    n<-rpois(length(t),t) #count

    xyplot(n ~ t,groups=i,
    type="o",key=simpleKey(as.character(1:3),x=0,y=1,lines=T))     N<-tapply(n,t,cumsum)

Now, what is the best way to convert N
to a vector that can be plotted?

    xyplot(N ~ t,groups=i,

Or is there a better way to get cumulative graphs?


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