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...8),nrow=2) b = c('red','green',1,2,3) d = data.frame( test1=c(223,445,'red',78,56) , test2= c('red',NA,NA,NA,NA) ) e= list(a,b,d) list1 = list(a,b,d,e) list2 = lapply(list1,function(list)(gsub("red","green",list))) str(list1) str(list2) but the structue fo the list changed. --------------------------------- Give spam the boot. Take control with tough spam protection [[alternative HTML version deleted]]

I am having difficulty understanding the syntax of the nlme() function for nonlinear mixed models. The data frame is called Marouane.chlorophyll. The model involves a dependent variable (Absorb) and an independent variable (Ch.surf), which are both numeric variables in the data frame. The data are hierarchically grouped as Espece, Plante nested within Espece, and Feuille nested within Plante

Hi, I have two model, challenge(embeds_many :tasks) and task(embedded_in :challenge), finally database structue is like this { "_id" : ObjectId("4db8b0524f0b495c3a7dbba4"), "title" : "Testing1", "created" : ISODate("2011-12-12T00:00:00Z"), "tasks" : [ { "name" : "task no 1", &quo...