# NOT RUN {
x <- lapply(1:3, function(i) { list(a=i,b=i^2) })
list.stack(x)
x <- lapply(1:3, function(i) { list(a=i,b=i^2,c=letters[i])})
list.stack(x)
x <- lapply(1:3, function(i) { data.frame(a=i,b=i^2,c=letters[i]) })
list.stack(x)
x <- lapply(1:3, function(i) { data.frame(a=c(i,i+1), b=c(i^2,i^2+1))})
list.stack(x)
# }
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