在R中使用igraph与bigmemory

Question

我无法在R

中阅读igraph中的bigmemory对象

    class(mcalls)
    [1] "big.matrix"
    attr(,"package")
    [1] "bigmemory"
    callGraph <- graph.data.frame(mcalls)
    Error in graph.data.frame(mcalls) : 
    the data frame should contain at least two columns

有没有在igraph中读取big.matrix数据类型？