DAG operations of ralget are now in the raldag package.

ralget

Ralget creates and combines graphs with algebraic operations.

Combining Vertices

Take the following vertices:

p <- v("p") 
q <- v("q") 
s <- v("s") 
r <- v("r") 

The + operator places vertices in the same graph.
The * operator joins one vertex to another.

g1 <- p * q + s
g2 <- q * s + q* r
g3 <- s * r

Combining graphs

Overlaying graphs ( + )

The + operator overlays graphs.

g1 + g2

Connecting graphs ( * )

The * operator creates a link from each vertex in the first graph to each vertex in the second graph.

g1 * g3

The Cartesian product ( %x% )

The %x% operator creates the graph product.

x %x% y
#> Joining, by = "name"

Some more on vertices

Vertices are created with the v() function, which takes a name and list of attributes associated with the vertex. This creates a ralget/tidygraph object:

v("x", Latitude=  78.26077, Longitude=  -94.11077)
#> # A tbl_graph: 1 nodes and 0 edges
#> #
#> # A rooted tree
#> #
#> # Node Data: 1 x 2 (active)
#>   name  .attrs          
#>   <chr> <list>          
#> 1 x     <named list [2]>
#> #
#> # Edge Data: 0 x 2
#> # … with 2 variables: from <int>, to <int>

Edges

Edge attributes are added by interleaving e() between graph multiplication.

Here’s a simple example:

v("X1") * e("E:X1.X2") * v("X2")

Installation

You can install the development version from GitHub with:

# install.packages("devtools")
devtools::install_github("ianmoran11/ralget")