On Wed, Jul 8, 2009 at 9:40 AM, Henrique Dallazuanna <www...@gmail.com>wrote:
> Its because '[[' accept only element, so you need use '[': > > q[crossRsorted[,1]] > > Henrique, I figured out what q[crossRsorted[,1]] does - it produces q[i] for all i in crossRsorted[,1]. Ok. Since a given index 'k' of q[[k]] can occur in multiple rows in crossRsorted[,1], this is not what I want. Meanwhile, I was able to express what I do want like so: crossRsorted[Filter(function (idx) mean(q[[idx]], na.rm = TRUE), unique(crossRsorted[,1])), ] but, I'm afraid, that's not really "R style." Or is it? But perhaps the only way? I think I'm starting to see the allure of R: every indexing task ends up a challenging puzzle. Which prevents Alzheimer's [1]. - Godmar [1] http://www.timesonline.co.uk/tol/life_and_style/article508785.ece [[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.
