[R] dividing a long column to many short ones by a condition

[Rui Barradas]

Hello,

Something like this?


grp <- cumsum(abs(c(0, diff(x == 0))))
tmp <- lapply(split(x, grp), function(x) if(all(x == 0)) NULL else x)
tmp[sapply(tmp, function(x) !is.null(x))]


Hope this helps,

Rui Barradas

Em 18-04-2013 10:33, Igor Mintz escreveu:
> hello
> i have a very long column of numbers. i want R to make a new column every
> time the value changes from zero.
> example for the column:
> 90.1194354
> 87.94788274
> 80.34744843
> 64.06080347
> 30.40173724
> 0
> 0
> 0
> 0
> 0
> 16.28664495
> 23.88707926
> 29.31596091
> 48.85993485
> 13.02931596
> 0
> 0
> 0
> 7.600434311
> 20.62975027
> 29.31596091
> 32.5732899
>
> for this example i want to get 3 columns.
>
> thanks!
>
> 	[[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at 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.
>