[R] running count in data.frame

[Mark Knecht]

Yes Jim. Thanks. That's what I was looking for. My mistake letting [pos] block.

Cheers,
Mark

On Tue, Jun 30, 2009 at 8:04 PM, jim holtman<jholtman at gmail.com> wrote:
> Not exactly sure what you want to count.  Does this do what you want (made a
> change in RunningCount)
>
<SNIP>
>> 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))
> +
<SNIP>
>> 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
<SNIP>