[R] Cumsum with a max and min value
I have a vector of values -1, 0, 1, say a - c(0, 1, 0, 1, 1, -1, -1, -1, 0, -1, -1) I want to create a vector of the cumulative sum of this, but I need to set a maximum and minimum value for the cumsum, for example: max_value - 2 min_value - -2 the expected result would be (0, 1, 1, 2, 2, 1, 0, -1, -1, -2, -2) The only way I managed to do It, was res - vector(length=length(a)) res[1] - a[1] for ( i in 2:length(a)) res[i] - res[i-1] + a[i] * (( res[i-1] max_value a[i] 0 ) | ( res[i-1] min_value a[i] 0 )) This is certainly not the best way to do it, so any suggestions? Henrique [[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.
Re: [R] Cumsum with a max and min value
Try this: ac - cumsum(a) ifelse(ac 2, max_value, ifelse(ac -2, min_value, ac)) On Thu, Nov 25, 2010 at 6:44 PM, henrique henri...@allianceasset.com.brwrote: I have a vector of values -1, 0, 1, say a - c(0, 1, 0, 1, 1, -1, -1, -1, 0, -1, -1) I want to create a vector of the cumulative sum of this, but I need to set a maximum and minimum value for the cumsum, for example: max_value - 2 min_value - -2 the expected result would be (0, 1, 1, 2, 2, 1, 0, -1, -1, -2, -2) The only way I managed to do It, was res - vector(length=length(a)) res[1] - a[1] for ( i in 2:length(a)) res[i] - res[i-1] + a[i] * (( res[i-1] max_value a[i] 0 ) | ( res[i-1] min_value a[i] 0 )) This is certainly not the best way to do it, so any suggestions? Henrique [[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. -- Henrique Dallazuanna Curitiba-Paraná-Brasil 25° 25' 40 S 49° 16' 22 O [[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.
Re: [R] Cumsum with a max and min value
On Thu, Nov 25, 2010 at 3:44 PM, henrique henri...@allianceasset.com.br wrote: I have a vector of values -1, 0, 1, say a - c(0, 1, 0, 1, 1, -1, -1, -1, 0, -1, -1) I want to create a vector of the cumulative sum of this, but I need to set a maximum and minimum value for the cumsum, for example: max_value - 2 min_value - -2 the expected result would be (0, 1, 1, 2, 2, 1, 0, -1, -1, -2, -2) Try this: f - function(x, y) max(min(x + y, max_value), min_value) Reduce(f, a, 0, accumulate = TRUE)[-1] -- Statistics Software Consulting GKX Group, GKX Associates Inc. tel: 1-877-GKX-GROUP email: ggrothendieck at gmail.com __ 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.
Re: [R] Cumsum with a max and min value
Does this do it; pmin(2, pmax(-2, cumsum(a))) [1] 0 1 1 2 2 2 1 0 0 -1 -2 On Thu, Nov 25, 2010 at 3:44 PM, henrique henri...@allianceasset.com.br wrote: I have a vector of values -1, 0, 1, say a - c(0, 1, 0, 1, 1, -1, -1, -1, 0, -1, -1) I want to create a vector of the cumulative sum of this, but I need to set a maximum and minimum value for the cumsum, for example: max_value - 2 min_value - -2 the expected result would be (0, 1, 1, 2, 2, 1, 0, -1, -1, -2, -2) The only way I managed to do It, was res - vector(length=length(a)) res[1] - a[1] for ( i in 2:length(a)) res[i] - res[i-1] + a[i] * (( res[i-1] max_value a[i] 0 ) | ( res[i-1] min_value a[i] 0 )) This is certainly not the best way to do it, so any suggestions? Henrique [[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. -- Jim Holtman Cincinnati, OH +1 513 646 9390 What is the problem that you are trying to solve? __ 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.
