[R] reshaping data frame

[John Kane]

Here is a very clumsy way to do it but I think it
works

fact1 <- rep("level.1", length(mydat[,1]))
fact2 <- rep("level.2", length(mydat[,1]))
lels <- c(fact1,fact2)
nams <- c("indiv", "case.id", "covar")
set1 <-  mydat[, c(1,2,3)] ; names(set1) <- nams 
set2 <-  mydat[,c(1, 4,5)] ; names(set2) <- nams

newdata <- cbind(lels, rbind(set1,set2))
mydata <- rbind(newdata[, c(2,1,4,3)], newdata[,
c(2,1,4,3)])
 names(mydata) <- c("indiv", "factor", "covar",
"caseid")
mydata[order(mydata$indiv, mydata$caseid,
mydata$factor),]


--- ahimsa campos-arceiz <ahimsa at camposarceiz.com>
wrote:

> Dear all,
> 
> I'm having a few problems trying to reshape a data
> frame. I tried with
> reshape{stats} and melt{reshape} but I was missing
> something. Any help is
> very welcome. Please find details below:
> 
> #################################
> # data in its original shape:
> 
> indiv <- rep(c("A","B"),c(10,10))
> level.1 <- rpois(20, lambda=3)
> covar.1 <- rlnorm(20, 3, 1)
> level.2 <- rpois(20, lambda=3)
> covar.2 <- rlnorm(20, 3, 1)
> my.dat <-
> data.frame(indiv,level.1,covar.1,level.2,covar.2)
> 
> # the values of level.1 and level.2 represent the
> number of cases for the
> particular
> # combination of indiv*level*covar value
> 
> # I would like to do two things:
> # 1. reshape to long reducing my.dat[,2:5] into two
> colums "factor" (levels=
> level.1 & level.2)
> # and the covariate
> # 2. create one new row for each case in level.1 and
> level.2
> 
> # the new reshaped data.frame would should look like
> this:
> 
> # indiv  factor    covar   case.id
> #   A   level.1   4.614105    1
> #   A   level.1   4.614105    2
> #   A   level.2  31.064405    1
> #   A   level.2  31.064405    2
> #   A   level.2  31.064405    3
> #   A   level.2  31.064405    4
> #   A   level.1  19.185784    1
> #   A   level.2  48.455929    1
> #   A   level.2  48.455929    2
> #   A   level.2  48.455929    3
> # etc...
> 
> #############################
> 
> Thank you very much!!
> 
> Ahimsa
> 
> 
> -- 
> ahimsa campos-arceiz
> www.camposarceiz.com
> 
> 	[[alternative HTML version deleted]]
> 
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