Hi On 20 Sep 2006 at 14:19, Dave Evens wrote:
Date sent: Wed, 20 Sep 2006 14:19:04 -0700 (PDT) From: Dave Evens <[EMAIL PROTECTED]> To: r-help@stat.math.ethz.ch Subject: [R] Spliting a huge vector > > Dear R users, > > I have a huge vector that I would like to split into > unequal slices. However, the only way I can do this is > to create another huge vector to define the groups > that are used to split the original vector, e.g. > > # my vector is this > a.vector <- seq(2, by=5, length=100) should not it be a.vector <- seq(2, by=5, length=803) > > # indices where I would like to slice my vector > cut.values <- c(30, 50, 100, 109, 300, 601, 803) > > # so I have to create another vector of similar length > # to use the split() command, i.e. > x <- rep(1:length(cut.values), times=diff(c(0, > cut.values)) here it throws syntactic error so I assume it shall have one more parentheses > > # this means I can use split() > split(a.vector, x) then times <- diff(c(0,cut.values)) do.call(function(x, y, times) split(x,rep(y, times=times)), list(x=a.vector, y= cut.values, times=times)) or split(a.vector,rep(1:length(cut.values), times=times)) is this what you want? However I am not sure that some vector is not created internally. HTH Petr > > This seems to be a waste in terms of memory usage as > I'm creating another vector (here "x") to split the > original vector. Is there a better way to split a huge > vector than this? Any help is much appreciated. > > Best, > Dave. > > ______________________________________________ > R-help@stat.math.ethz.ch 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. Petr Pikal [EMAIL PROTECTED] ______________________________________________ R-help@stat.math.ethz.ch 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.