I'm not entirely sure what you mean, but it's likely one of these: apply(data, 2, function(x) mean(x[x>75])) mean(data[ apply(data,1, function(x) all(x > 75), ]) mean(data[data>75])
Three questions to give more concrete help: i) Is your data set stored as a matrix or a data.frame ii) What are you trying to get the mean of -- all variables pooled or of each variable independently? iii) When you say >=75 for all variables, do you mean only use a row if it's >=75 for each element or just only use the >=75 elements for each calculation independently. Michael On Wed, Feb 1, 2012 at 2:38 PM, Yakamu Yakamu <iam_yak...@yahoo.com> wrote: > hi, > I have a dataset with more than 15000 data and would like to calculate the > mean for only those that is bigger than and equal to 75 for all variables > (x,y,z1,z2,u,v,w z1 and z2). > my dataset is (for example) as follows : > x y z1 z2 u v w1 w2 > 95 83 57 50 59 39 90 48 > 100 92 83 82 93 92 50 50 > 39 40 59 68 59 49 60 89 > 80 80 79 57 70 79 50 79 > 78 88 98 67 79 89 79 90 > and so on... > any help would be appreciated, > big thanks in advance, > Yakamu > [[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. ______________________________________________ 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.
