Drawing the ExprGraph with Graphviz (dot)
The encoding package of Gorgonia contains a function to marshal the ExprGraph into the dot language.
This make it possible to use the graphviz program to generate png or svg versions of the graph.
A simple way to do it:
package main
import (
"fmt"
"log"
"gorgonia.org/gorgonia"
"gorgonia.org/gorgonia/encoding/dot"
)
func main() {
g := gorgonia.NewGraph()
var x, y *gorgonia.Node
// define the expression
x = gorgonia.NewScalar(g, gorgonia.Float64, gorgonia.WithName("x"))
y = gorgonia.NewScalar(g, gorgonia.Float64, gorgonia.WithName("y"))
gorgonia.Add(x, y)
b, err := dot.Marshal(g)
if err != nil {
log.Fatal(err)
}
fmt.Println(string(b))
}Running this program and sending its output into the dot process produces a picture.
for example:
$ go run main.go | dot -Tsvg > dot-example.svgproduces this graph:
