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...uestion re:using "gsub" (or some similar functions) on the contents of a list. I want to design a function that looks at "everything" contained din a list, and anytime it finds the text string "pattern" replace it with "x". I also wish to preserve the "structure" of the original list. What is a good way to accomplish this? I tried : a = matrix(data=c(23,45,'red',78),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...

...gt; fit<-nlme(model=Absorb~ k1 - (1/(b*Ch.surf)), + data=Marouane.chlorophyll,fixed=k1+b~1, + groups=~Espece/Plante, + start=list(k1=97.8, b=4.68)) However, there is something wrong with this syntax because I get the following error: Problem in names<-: Invalid length for names attribute: structu re(.Data = list(structure(.Data = numeric(0), class .... Can someone explain what I am doing wrong? Bill Shipley North American Editor, Annals of Botany Editor, "Population and Community Biology" series, Springer Publishing Département de biologie, Université de Sherbrooke, She...

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", &qu...