I have a list as follows:

alist <- list(number1 = structure("something", .Dim = c(1L, 1L)), number2 = structure("something", .Dim = c(1L, 
1L)))

If I want to stack this list:

stack(alist)

It says: Error in stack.default(test) : at least one vector element is required

Why does this happen and how can I prevent this?

CodePudding user response：

Try this:

stack(unlist(alist))