Nothing

```
# Test of "link" and "add":
# demo("startup", package = "dynamicGraph", verbose = FALSE)
source(paste(system.file(package = "dynamicGraph"),
"demo.source/startup.R", sep = "/"))
control <- dg.control(UserMenus = Menus, returnLink = TRUE,
width = 150, height = 200, margin = 200)
simpleGraph.Z.1 <- new("dg.simple.graph",
vertex.names = V.Names[1:3], types = V.Types[1:3],
from = c(1, 2, 3), to = c(2, 3, 1))
graph.Z.1 <- as(simpleGraph.Z.1, "dg.graph")
Z <- dg(graph.Z.1, modelObject = Object, control = control, title = "Z")
simpleGraph.WV.1 <- new("dg.simple.graph", from = c(2, 3), to = c(3, 1))
graph.WV.1 <- simpleGraphToGraph(simpleGraph.WV.1,
vertexList = graph.Z.1@vertexList,
blockList = graph.Z.1@blockList)
W <- addModel(graph.WV.1,
frameModels = Z, control = control, title = "W")
V <- addView(graph.WV.1,
frameModels = Z, modelIndex = 1, control = control,
viewType = "Factor", title = "W")
simpleGraph.U.1 <- new("dg.simple.graph", from = 1, to = 2)
graph.U.1 <- simpleGraphToGraph(simpleGraph.U.1,
Vertices = graph.Z.1@vertexList,
BlockList = graph.Z.1@blockList)
U <- replaceModel(graph.U.1,
frameModels = Z, modelIndex = 1, graphIndex = 1,
control = control, title = "U")
```

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