Hello,
I am trying to convert BY to a data frame, consider the following example:
exampleDF<-data.frame(a=c(1,2),b=c(10,20),name=c("first","second"))
exampleBY<-by(exampleDF,with(exampleDF,paste(a,b,sep="_")),
function(x) {
data.frame(
name=as.character(x$name),
a=x$a,
b=x$b,
c=x$a + x$b)
}
)
I made this function:
convertByToDataFrame <- function( byObject ) {
data.frame(matrix(unlist(byObject),nrow=length(byObject),ncol=length(byObject[[1]]),byrow=TRUE,dimnames=list(NULL,names(byObject[[1]]))))
}
but when I run it:
convertByToDataFrame(exampleBY)
I either: (1) loose the types of the different values in the BY, or 2) get
factors instead of the values
I tried the following but it doesn't scale:
exampleSUMRY <- data.frame(a =
as.vector(unlist(lapply(strsplit(names(exampleBY),split="_"),function(x)
x[1]))),
b =
as.vector(unlist(lapply(strsplit(names(exampleBY),split="_"),function(x)
x[2]))),
name=as.vector(unlist(lapply(exampleBY,function(x)
x[[1]]))))
Any suggestions?
Thank you,
Ramiro
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