add_prism: Add a prism of nodes to the graph

Description Usage Arguments Value Examples

View source: R/add_prism.R

Description

With a graph object of class dgr_graph, add a node prism to the graph.

Usage

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add_prism(graph, n, type = NULL, label = TRUE, rel = NULL, ...)

Arguments

graph

a graph object of class dgr_graph.

n

the number of nodes describing the shape of the prism. For example, the triagonal prism has n equal to 3 and it is composed of 6 nodes and 9 edges. For any n-gonal prism, the graph will be generated with 2n nodes and 3n edges.

type

an optional string that describes the entity type for the nodes to be added.

label

either a vector object of length n that provides optional labels for the new nodes, or, a boolean value where setting to TRUE ascribes node IDs to the label and FALSE yields a blank label.

rel

an optional string for providing a relationship label to all new edges created in the node prism.

...

optional node attributes supplied as vectors.

Value

a graph object of class dgr_graph.

Examples

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# Create a new graph and add 2 prisms
graph <-
  create_graph() %>%
  add_prism(
    n = 3,
    type = "prism",
    label = "a") %>%
  add_prism(
    n = 3,
    type = "prism",
    label = "b")

# Get node information from this graph
node_info(graph)
#>    id  type label deg indeg outdeg loops
#> 1   1 prism     a   3     1      2     0
#> 2   2 prism     a   3     1      2     0
#> 3   3 prism     a   3     1      2     0
#> 4   4 prism     a   3     2      1     0
#> 5   5 prism     a   3     2      1     0
#> 6   6 prism     a   3     2      1     0
#> 7   7 prism     b   3     1      2     0
#> 8   8 prism     b   3     1      2     0
#> 9   9 prism     b   3     1      2     0
#> 10 10 prism     b   3     2      1     0
#> 11 11 prism     b   3     2      1     0
#> 12 12 prism     b   3     2      1     0

# Attributes can be specified in extra
# arguments and these are applied in order;
# Usually these attributes are applied to
# nodes (e.g., `type` is a node attribute)
# but the `rel` attribute will apply to the
# edges
graph_w_attrs <-
  create_graph() %>%
  add_prism(
    n = 3,
    label = c("one", "two",
              "three", "four",
              "five", "six"),
    type = c("a", "a",
             "b", "b",
             "c", "c"),
    value = c(1.2, 8.4,
              3.4, 5.2,
              6.1, 2.6),
    rel = "prism")

# Get the graph's node data frame
get_node_df(graph_w_attrs)
#>   id type label value
#> 1  1    a   one   1.2
#> 2  2    a   two   8.4
#> 3  3    b three   3.4
#> 4  4    b  four   5.2
#> 5  5    c  five   6.1
#> 6  6    c   six   2.6

# Get the graph's edge data frame
get_edge_df(graph_w_attrs)
#>   id from to   rel
#> 1  1    1  2 prism
#> 2  2    2  3 prism
#> 3  3    3  1 prism
#> 4  4    4  5 prism
#> 5  5    5  6 prism
#> 6  6    6  4 prism
#> 7  7    1  4 prism
#> 8  8    2  5 prism
#> 9  9    3  6 prism

DiagrammeR documentation built on Sept. 7, 2017, 1:06 a.m.