[R] looping through tasks

From: E. Michael Foster <emfoster_at_unc.edu>
Date: Thu 16 Feb 2006 - 12:38:52 EST


Hi,

I'm moving (slowly) to R from STATA.
I often have need to move through a set of tasks across a series of years. In this case, you can see that I'm mimicking -reshape- in STATA, but I'm less interested in the
task than in programming R.

    library(foreign)
    mydata<-read.dta("z:\example.dta")
    for (y in 2000:2002) {
    myvar<-paste("score",y,sep="") # x is available for each year     assign( eval(myvar),
    data.frame(cbind(mydata[,c("var1", eval(myvar))],c(eval(y)))))     colnames(eval(myvar))<-c("person","score","year")     }

I"m getting the error, "
Error in "colnames<-"(`*tmp*`, value = c("newid", "score", "year")) : attempt to set colnames on object with less than two dimensions Whether I set up a data frame or not doesn't matter.

As you might guess, what I want to do at the end is rbind the little files, and the lack of consistent column names causes the program to choke.

Suggestions? /m

-- 

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Received on Thu Feb 16 15:13:25 2006

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