Re: [R] More efficient data-block processing

HI Craig, Assuming that this is similar to what you tried: dat <- read.table(text="member code 1 A 1 C 1 F 2 B 2 E 3 D 3 A 3 B 3 D 4 G 4 A",sep="",header=TRUE,stringsAsFactors=FALSE)  code.list <- LETTERS[1:5] n.mbr <- 4  mbr.list <- 1:4 matrix.mat <- matrix(0,ncol=length(code.list),nrow=length(u

[R] More efficient data-block processing -revised

I have a medical insurance claims datafile divided into blocks by member, with multiple lines per member. I am processing these into a one line per member binary model matrix. Member block sizes vary from 1 to 50+. I am matching attributes in claims data to columns in the model matrix and have b