# How-to: Construct petridish plots in R

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** Script for petridish layout in R**

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library(igraph) # create empty graph g <- graph.empty(directed=FALSE) node_id <- c(1:1000) # add nodes g <- add.vertices(g, nv=1000, vert_colour=sample(c('blue','red','yellow','green','purple'),1000,replace=T)) # add edges E <- sample(0:999,2000,replace=T) g <- add.edges(g,E) # optimize layout lay <- layout.fruchterman.reingold(g) # plot graph plot(g,layout=lay,vertex.label='',vertex.size=2,vertex.color=V(g)$vert_colour) |

**Plot generated for this example**:

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