重复顶点 ID R

Question

我正在尝试制作网络可视化，以便从经理调用活动到商店位置。唯一的问题是我不断收到错误“重复的顶点 ID”。我需要有多个相同的顶点 ID，因为一位经理已经调用了多个商店。我该如何解决这个问题？

我的边缘数据组织如下：

from    to    weight
12341    1      5
12341    2      4
23435    1      3

我的节点数据只包含 from 列：

from   
12341
12341
23435

这是我尝试运行的代码：

MANAGER_LOC <- graph_from_data_frame(d = edges, vertices = nodes, 
directed = TRUE)

Answer 1

您收到重复的顶点 ID 错误，因为您需要引用 vertices = 中的唯一节点数据。您可以使用unique(nodes)，但这会给您带来另一个错误，因为您在邻接列表数据中引用的节点1 和2 不包含在您的nodes 数据中。

您的节点数据不能只包含来自edges$from 列的唯一值，它必须包括来自edges$from 和edges$to 的所有唯一值，因为您将adjacency list 数据传递给graph_from_data_frame() 函数。

所以在edges$to 中，您还需要按名称引用顶点，如edges$from 中那样，例如12341 或 23435。

这里有一些 R 代码，可能包括您想要实现的目标。

#graph from your data frame
MANAGER_LOC <- graph_from_data_frame(
  d = edges
  ,vertices = unique(c(edges$from, edges$to))
  ,directed = TRUE);

#plot also includes vertices 1 and 2
plot(
  x = MANAGER_LOC
  ,main = "Plot from your edges data");


#plot from your data assuming you are referencing an id in edges$to
MANAGER_LOC <- graph_from_data_frame(
  d = merge(
    x = edges
    ,y = data.frame(
      to_vertice_id = 1:length(unique(edges$from))
      ,to_vertice = unique(edges$from))
    ,by.x = "to"
    ,by.y = "to_vertice_id"
    ,all.x = T)[,c("from","to_vertice","weight")]
  ,vertices = unique(edges$from)
  ,directed = TRUE);

#plot does not include vertices 1 and 2
plot(
  x = MANAGER_LOC
  ,main = "Plot assuming vertice ID
  reference in edges$to");


#plot from your data assuming you are referencing the xth value of edges$from in edges$to
MANAGER_LOC <- graph_from_data_frame(
  d = merge(
    x = edges
    ,y = data.frame(
      to_vertice_ref = 1:nrow(edges)
      ,to_vertice = edges$from)
    ,by.x = "to"
    ,by.y = "to_vertice_ref"
    ,all.x = T)[,c("from","to_vertice","weight")]
  ,vertices = unique(edges$from)
  ,directed = TRUE);

#plot does not include vertices 1 and 2
plot(
  x = MANAGER_LOC
  ,main = "Plot assuming edges$from
  reference in edges$to");