User Guide - GraphFilter/GraphFilter Wiki

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Creating a New Project

To create a New Project in Graph Filter, it's necessary that you complete the steps of the Wizard. Here, we will try to give you an overview of the program, explaining each page of the Wizard step-by-step, how it works and how to fill it.

Opening the program, you will see the Main Window, with two button options: Open and New Project.

Project information

First, it will be asked the Project Name and the Project location where you want to save the project.


You can enter equations and inequalities in two ways:

For a better visualization, when you type an invariant name, the text is converted into symbols in the text box. The buttons work the same way, by automatically placing the symbol in the input. Some invariants and operations on graphs already have a usual symbology, those that do not have a fixed notation, also use some symbology by initials or abbreviations.

The buttons are organized into tabs, divided into the following sections:

This page also has the following features:


χ(ℓ(G))/2 ≤ floor(μ₁(G))+1-π^2

Half of the chromatic number of the line graph is less than or equal to the floor of the greatest Laplacian eigenvalue plus the constant 1 minus π squared

EE(G)+diam(comp(ℓ(G)) > ln(λ₂(G))

Estrada index of the graph plus the diameter of the complement graph is greater than the logarithm (euler) of the second largest eigenvalue of the graph

Δ(G) > 5 AND r(Ƙ(G)) == diam(G) AND Е(G) > 10

Maximum graph degree greater than 5 AND radius of graph clique coincides with graph diameter AND the graph has at least 10 edges.


Conditions utilizes Boolean Invariants to filter the graphs. You can mark a condition as:

These are also divided into structural and spectral invariants, as in numeric invariants.


The program disposes of two types of filtering:

Graph Files

The program filter graphs in the Graph6 format, that stores undirected graphs in a compact manner, using only printable ASCII characters. Files in this format have text type and contain one line per graph.

The program reads these graphs from a .txt or .g6 file formats. You can choose as many files as you want.


You don't need to know how the format works. You can use websites to create it for you or let you download already-made lists of graphs. For example:


The last step of the wizard is a review page where you can confirm the configurations you have settled up so far.

Clicking in the Start button, a Loading Screen appears, showing you the progress of the filtering. When the load finishes, you can see the Project Window.

Project Window

At the Project Window, you can see the result of your filtering.

Tool bar

On the tool bar in the top of the window, there is a combo-box with a list of the resulting graphs and their respective graph6 code. There is also two arrows to help you change from a graph to another.


The project window is divided in four docks:

The docks are floatable, which means that they can be replaced in another part or the window, or even removed from the project, appearing in a separate window. To do that, drag and drop the desired dock to the new place you want it to be.

Docks can also be closed by clicking in the x button at the top bar.

After closing it, if you want to enable them again, go to View and choose the dock you want to see.

After moving the docks around. if you want to restore the default layout, go to Window>Restore Default Layout


In here you see see an interactive plot of the selected graph.
You can drag and drop vertices around the canvas, pressing and hold the left mouse button.
With the mouse scroll wheel, you can zoom in or out the image of the graph.

Clicking with the right mouse button, you will see a few options:


This dock exhibits a check list where you can choose invariants to be calculated upon the current selected graph at the combo-box in the tool bar.


Displays a table with the results of the checked invariants at Invariants dock. It can be resized to better visualization of the big results.


Contains a list of invariants, and displays a brief definition for them.

Export options

Current graph

You can export the current graph by click with the right mouse button in the Visualize dock, go to Export... option and choose the format you want, that can be:

All graphs

You can also export all the graphs at once, by going to File>Export all graphs to and choose the format you want, that can be: