r - tbl_graph 函数失败

Question

我应用 igraph 来可视化讨论论坛上的网络。

rt_net <- tbl_graph(nodes = nodes, edges = edges, directed = TRUE)
Error in (function (edges, n = max(edges), directed = TRUE)  : 
  At type_indexededgelist.c:117 : cannot create empty graph with negative number of vertices, Invalid value

当我检查 edgelist 的矩阵时，没有负数。我还用 0 填充缺失值