# Random Graph Generation

If you need to quickly create random graphs in `.elkt` or `.elkg` format, you can use our random graph creation DSL. This way you can save, store, comment and diff your random graph configurations easily!

To get started, create a file with the file ending `.elkr`. Now Eclipse will offer the usual features you know and love, such as code completion, syntax highlighting and validation. So remember Eclipse rule number 1: Ctrl+Space is your friend!

Now let’s generate some random graphs. The following configuration would generates 5 trees and two graphs using the default predefined values:

    generate 5 trees
    generate 2 graphs

Right-clicking the saved file in the package explorer and choosing Generate Random Graphs will result in seven graph files to be created. You can further specify how the graphs are created. For example:

    generate 2 graphs {
        // Gaussian distribution: mean +/- standard deviation
        nodes = 20 +/- 5 {
            // With ports and extra options block
            ports {
                // Set port constraint to fixed order
                constraint = order

                // Equal distribution: min to max. Re-use 30%
                // to 40% of ports, i.e. different edges exit
                // or enter same port
                re-use = 0.3 to 0.4
            }

            // Generate node labels
            labels
        }

        // Relative to the number of nodes
        edges relative = 0.5 to 1.5 {
            // Allow self loops
            self loops
        }

        filename = "whatABeautifulGraph"
    }

There are a lot more options to be found. Again, use Ctrl-Space to find out more.

- Tool Developers
- Graph Data Structure
- Coordinate System
- Layout Options
- JSON Format
- ELK Text Format
- Using Algorithms Directly
- Using Plain Java Layout
- Using Eclipse Layout
- Connecting to ELK
- Advanced Configuration
- Layout View Support
- Dependency Injection
- Algorithm Developers
- Getting Eclipse Ready
- Creating a New Project
- ELK Metadata Language
- Automatic Builds
- Algorithm Implementation
- Structuring Algorithms
- Algorithm Debugging
- Random Graph Generation
- Unit Tests
- ELK Contributors
- Development Setup
- Development Workflow
- Installing With Oomph
- Building ELK