similar to: NA or work around ??

I'm just learning and this is probably very simple, but I'm stuck. I'm trying to understand the by(). This works. by(TestData, LEAID, summary) But, This doesn't. by(TestData, LEAID, median(RATIO)) ERROR: could not find function "FUN" HELP! Thanks, LA -- View this message in context: http://n4.nabble.com/by-function-tp955789p955789.html Sent from the R help

Hey Guys, It sure seems I get stuck on things that should be easy. Heres my question: PARCELS<-by(ResImp[ , "ACCOUNTNO"], ResImp["Property"], length) > PARCELS Property: UNSOLD [1] 9053 ------------------------------------------------------------------------------------------- Property: SOLD [1] 578

Hi all, I''m having trouble figuring out how to handle stock levels in a new store I''m building. When products are entered into the admin of the store, they have a stock number associated with them. What I''m not sure about, is how I go about maintaining this stock level. Take this scenario: 1. User A adds an item to their cart, and I check that it''s in stock -

Hi folks, I need some help in customizing the abline() function to be used in a lattice plot. I have attached a reproducible example below. I need help in the following snippet: disc <- xyplot(cnt_gt50pct_disc ~ week_num|sku_num, data=DF,type = "h",lwd=2,panel = function(...) { panel.abline(v = 8, lty = 2) panel.xyplot(...) }) Is there a way I can give

Dave, on another topic, might I recommend that you and DHH publish an updated version of the Agile guide right away when 1.1 comes out? You could reuse much of your material and it would do a lot of good to help make sure there is still a good centralized source of reference for Rails. Without that book, there really is not a good one-stop source of information for people to learn how to use