Not exactly sure what you want to count. Does this do what you want (made a
change in RunningCount)
> AddCols = function (MyFrame) {
+ MyFrame$p<-0
+ MyFrame$l<-0
+ MyFrame$pc<-0
+ MyFrame$lc<-0
+ return(MyFrame)
+ }
>
> BinPosNeg = function (MyFrame) {
+
+ ## Positive y in p column, negative y in l column
+ pos <- MyFrame$y > 0
+ MyFrame$p[pos] <- MyFrame$y[pos]
+ MyFrame$l[!pos] <- MyFrame$y[!pos]
+ return(MyFrame)
+ }
>
> RunningCount = function (MyFrame) {
+ ## Running count of p & l events
+
+ pos <- (MyFrame$p > 0)
+ MyFrame$pc <- cumsum(as.integer(pos))
+ pos <- (MyFrame$l < 0)
+ MyFrame$lc <- cumsum(as.integer(pos))
+
+ return(MyFrame)
+ }
>
> F1 <- data.frame(x=1:10, y=-4:5)
> F1 <- AddCols(F1)
> F1
x y p l pc lc
1 1 -4 0 0 0 0
2 2 -3 0 0 0 0
3 3 -2 0 0 0 0
4 4 -1 0 0 0 0
5 5 0 0 0 0 0
6 6 1 0 0 0 0
7 7 2 0 0 0 0
8 8 3 0 0 0 0
9 9 4 0 0 0 0
10 10 5 0 0 0 0
> F1 <- BinPosNeg(F1)
> F1
x y p l pc lc
1 1 -4 0 -4 0 0
2 2 -3 0 -3 0 0
3 3 -2 0 -2 0 0
4 4 -1 0 -1 0 0
5 5 0 0 0 0 0
6 6 1 1 0 0 0
7 7 2 2 0 0 0
8 8 3 3 0 0 0
9 9 4 4 0 0 0
10 10 5 5 0 0 0
> F1 <- RunningCount(F1)
> F1
x y p l pc lc
1 1 -4 0 -4 0 1
2 2 -3 0 -3 0 2
3 3 -2 0 -2 0 3
4 4 -1 0 -1 0 4
5 5 0 0 0 0 4
6 6 1 1 0 1 4
7 7 2 2 0 2 4
8 8 3 3 0 3 4
9 9 4 4 0 4 4
10 10 5 5 0 5 4
>
>
On Tue, Jun 30, 2009 at 10:49 PM, Mark Knecht <markkne...@gmail.com> wrote:
> Hi,
> I need to keep a running count of events that have happened in my
> data.frame. I found a document called usingR that had an example of
> doing this for random coin flips and I tried to modify it. It seems to
> sort of work in the beginning, but then it stops and I don't
> understand why. I'm trying to duplicate essentially the Excel
> capability of =SUM($A$1:$A(Row number))
>
> The example looked like this:
>
> x = cumsum(sample(c(-1,1),100,replace=T))
>
> which does seem to work: (100 shortened to 20 for email)
>
> > cumsum(sample(c(-1,1),20,replace=T))
> [1] 1 0 1 0 1 2 3 4 5 4 3 4 5 6 7 6 5 4 5 6
> > cumsum(sample(c(-1,1),20,replace=T))
> [1] 1 2 1 2 1 2 3 2 3 4 5 6 7 8 7 8 7 8 9 8
> > cumsum(sample(c(-1,1),20,replace=T))
> [1] 1 0 1 0 1 0 1 2 3 4 5 6 7 8 7 8 7 6 7 8
> > cumsum(sample(c(-1,1),20,replace=T))
> [1] 1 0 1 0 1 0 -1 0 1 0 1 0 1 2 1 0 1 2 3 4
> > cumsum(sample(c(-1,1),20,replace=T))
> [1] 1 2 1 0 -1 0 -1 -2 -1 -2 -1 -2 -1 -2 -3 -2 -3 -4 -5 -6
>
> However that example doesn't have to read from the data.frame so I
> tried to leverage on some earlier help today but it isn't working for
> me. The goal is the MyFrame$lc keeps a running total of events in the
> MyFrame$l column, and likewise for $pc and $p. It seems that $lc
> starts off OK until it gets to a 0 and then resets back to 0 which I
> don't want. The $pc counter never seems to count. I also get a warning
> message I don't understand so clearly I'm doing something very wrong
> here:
>
> > F1 <- RunningCount(F1)
> Warning messages:
> 1: In MyFrame$pc[pos] <- cumsum(as.integer(pos)) :
> number of items to replace is not a multiple of replacement length
> 2: In MyFrame$lc[pos] <- cumsum(as.integer(pos)) :
> number of items to replace is not a multiple of replacement length
> > F1
> x y p l pc lc
> 1 1 -4 0 -4 0 1
> 2 2 -3 0 -3 0 2
> 3 3 -2 0 -2 0 3
> 4 4 -1 0 -1 0 4
> 5 5 0 0 0 0 0
> 6 6 1 1 0 0 0
> 7 7 2 2 0 0 0
> 8 8 3 3 0 0 0
> 9 9 4 4 0 0 0
> 10 10 5 5 0 0 0
> >
>
> I wanted $lc to go up to 4 and then hold 4 until the end. $pc should
> have stays 0 until line 6 and then gone up to 5 at the end.
>
> Any and all inputs appreciated on what I'm doing wrong.
>
> Thanks,
> Mark
>
>
>
>
>
> AddCols = function (MyFrame) {
> MyFrame$p<-0
> MyFrame$l<-0
> MyFrame$pc<-0
> MyFrame$lc<-0
> return(MyFrame)
> }
>
> BinPosNeg = function (MyFrame) {
>
> ## Positive y in p column, negative y in l column
> pos <- MyFrame$y > 0
> MyFrame$p[pos] <- MyFrame$y[pos]
> MyFrame$l[!pos] <- MyFrame$y[!pos]
> return(MyFrame)
> }
>
> RunningCount = function (MyFrame) {
> ## Running count of p & l events
>
> pos <- (MyFrame$p > 0)
> MyFrame$pc[pos] <- cumsum(as.integer(pos))
> pos <- (MyFrame$l < 0)
> MyFrame$lc[pos] <- cumsum(as.integer(pos))
>
> return(MyFrame)
> }
>
> F1 <- data.frame(x=1:10, y=-4:5)
> F1 <- AddCols(F1)
> F1
> F1 <- BinPosNeg(F1)
> F1
> F1 <- RunningCount(F1)
> F1
>
> ______________________________________________
> R-help@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<http://www.r-project.org/posting-guide.html>
> and provide commented, minimal, self-contained, reproducible code.
>
--
Jim Holtman
Cincinnati, OH
+1 513 646 9390
What is the problem that you are trying to solve?
[[alternative HTML version deleted]]
______________________________________________
R-help@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.
