28 functions for different tasks of graph theory
GrTheory  Graph Theory Toolbox.
Functions:
grBase  find all bases of digraph;
grCoBase  find all contrabases of digraph;
grCoCycleBasis  find all independent cutsets for a connected graph;
grColEdge  solve the color problem for graph edges;
grColVer  solve the color problem for graph vertexes;
grComp  find all components of graph;
grCycleBasis  find all independent cycles for a connected graph;
grDecOrd  solve the problem about decomposition of the digraph to the sections with mutually accessed vertexes (strongly connected components);
grDistances  find the distances between any vertexes of graph;
grEccentricity  find the (weighted) eccentricity of all vertexes, radius, diameter, center vertexes and the periphery vertexes;
grIsEulerian  find the Eulerian cycle of graph;
grIsomorph  solve the problem about isomorphism for two graphs;
grMaxComSu  solve the maximal complete sugraph problem for the graph;
grMaxFlows  solve the maximal flow problem for the digraph;
grMaxMatch  solve the maximal matching problem for the graph;
grMaxStabSet  solve the maximal stable set problem for the graph;
grMinAbsEdgeSet  solve the minimal absorbant set problem for the graph edges;
grMinAbsVerSet  solve the minimal absorbant set problem for the graph vertexes;
grMinCutSet  solve the minimal cutset problem for the digraph;
grMinEdgeCover  solve the minimal edge cover problem for the graph;
grMinSpanTree  solve the minimal spanning tree problem for the graph;
grMinVerCover  solve the minimal vertex cover problem for the graph;
grPERT  solve the project evaluation research task;
grPlot  draw the plot of the graph (digraph);
grShortPath  solve the shortest path problem for the digraph;
grShortVerPath  for digraph with weighted vertexes solve the problem about the path with minimal weight of verticies;
grTranClos  built the transitive closure for the digraph;
grTravSale  solve the nonsymmetrical traveling salesman problem;
grValidation  auxiliary function (the data validation);
grTheoryTest  test program for all functions.
1.3  New function grShortVerPath is added. 

1.2  Bugs in some functions for work with the isolated vertexes were corrected. Thanks to Marcin Eichner! 

1.1  two new functions are added 

The function grDecOrd has update. 

Two new functions is added 

Two new functions is added. One function with bugs is deleted. 

The function grPERT is added. 

The grMinSpanTree had update;


The function grMinAbsEdgeSet are included. 

Summary title is updated 

All functions are updated, new functions are added. 

CycleBasis is updated 

PlotGraph is updated 

The new email is added 

ShortPath had update for fast calculation 

Draws the graph and solves the tasks: Maximal Flow, Maximal Matching, Minimal Vertex Cover, Minimal Spanning Tree, Shortest Path etc. 

Draws the graph and solves the tasks: Maximal Flow, Maximal Matching, Minimal Vertex Cover, Minimal Spanning Tree, Shortest Path etc. 

A bug in grPlot is corrected. 
Emeka Ezeanya (view profile)
Is it possible to use a different number of nodes and degree of nodes apart from the ones given? What if you want to choose a fewer number of nodes?
Sergey Kasyanov (view profile)
Han Li (view profile)
I'm trying to use grIsmorph, but is asking for function psimilar...
Where can I find this?
V L (view profile)
komal (view profile)
kindly give detail about how to install n use grtheory tool box. given information is not complete. help me please
abishek ganesan (view profile)
i have installed this grtheory toolbox
Can anyone tel me how to work with it please
Ahmef Adel (view profile)
good gooop
sam esa (view profile)
dear sir, I would ask if matlab toolbox function have function or program on Binary Decision Diagram algorithm ... thank you
Chenjie (view profile)
Liang (view profile)
Muhammad Abrar Akber (view profile)
MIQP is missing to use grTravSale, How and where to get it?
Rohini Sharma (view profile)
Sir I am new to MATLAB . I have downloaded your codes for WSN, oneRoundWSN.m
please tell me how to rin this in MATLAB.
Thanks
Yonggon (view profile)
Sumantra, make sure your graph is connected. As long as your graph is connected, you should get correct result.
For this one, with arbitrary edges to make the graph connected without introducing any new cycle, I get
2572, 2581172, and 25814151172.
Sumantra Sarkar (view profile)
I think there is a bug in the grCycleBasis function. I have a large edge matrix, a part of which is:
2 5
2 7
5 8
5 7
7 11
8 11
8 14
11 15
14 15
Clearly, there are three cycles in this graph. viz. 2572, 571185 and 81115148. However, the function fails to recognize these three cycles individually and returns 2587112 and 25814151172, completely ignoring the edges 57 and {57,811} respectively. It happens for several other subsets also. Please suggest a solution.
Thank you.
p.s. It calculates the number of cycles correctly though.
Martin (view profile)
kira (view profile)
Hi:
I'm also trying to use grIsmorph, but is asking for function psimilar...
Where can you find this?
Nina (view profile)
Adina Stoica (view profile)
Hi! I am trying to run grTheoryTest for isomorphism (case 12) but it's looking for the function or method psimilar. I googled for the file psimilar.m as well as search this site for it. Help? Please? Pretty please, I need this to work in a week :(
Also, do you know how to do subgraphs? Apart from doing a for while removing and adding various vertices?
kira (view profile)
Hi, I have a question using grplot...
For my purposes, I need to draw digraphs with 'vplotstyle'='ko'... and I also need that the arrows don't go to the center of the nodes, ie, not to the vertex position, but to the edge of the circles... I'm looking at the code, and I have identified the vector that generates the edges... but I still don't know how to modify them to do what I want... Could you give some clue...
Greetings...
Tianfan XUE (view profile)
Excellent Job! Thank you very much!
Sergii Iglin (view profile)
The size of task is determined by the function BINTPROG.
Wang (view profile)
There is something wrong with grMinVerCover.m and grMinEdgeCover.m when worked in largescale complex networks(1000 nodes, 2500 edges). The result are both empty cell matrix. But it works well in smallscale networks.
So I want to konw whether there is limited to input data.
Thank you.
Sergii Iglin (view profile)
>> E=[1 2;1 4;1 5;2 3;2 4;2 5;3 4;3 5;4 5]
E =
1 2
1 4
1 5
2 3
2 4
2 5
3 4
3 5
4 5
>> nMS=grMaxComSu(E)
nMS =
1
2
4
5
Tomaz (view profile)
I think there is even more serious bug in grMaxComSu.m than Florian suggested.
For example, I forwarded the function following set:
E=[1 2;1 4;1 5;2 3;2 4;2 5;3 4;3 5;4 5]
function returned completely wrong result.
If I don't seriously misunderstand concept of max complete subgraph, the solution should be graph with nodes 1,2,4,5.
However, function suggests nonlogical solution: 1,2.
Can somebody please retest this and confirms the problem or explain to me, where does my logic go wrong?
If somebody already encountered this problem, I would appreciate if she/he would share with us the observation or even a solution.
Sergeii great overall work and it would be really nice to see this bug removed...
Does anybody know any other public file for solving the problem of searching max complete subgraph?
Florian (view profile)
does exactly what I'm looking for!
A minor bug in grMaxComSu.m
If the graph itself is a clique e.g. [1 2; 1 3; 2 3] the function gives an error. E1 in the code is then empty. Possibly account for this cas in a future version. Great work!
Andrew Jackson (view profile)
good job
very good!
Comment to Swamy Korada: Finding all possible paths between 2 nodes is an NPhard problem. Any such algorithm would either give an approximate solution, or take exponential time.
Great work
Is there a script to find all possible paths between 2 nodes?
can you send me complex networks analysis codes
Good package it sounds!
One additional question: Could the input be thousands of nodes in one graph?
thanks
it is very good toolbox
There are some bugs
Excellent
Beautiful job!
Salesman problem doesn't work without miqp function. But where could I find it???
I`m very interesting by the theory of managment
Great job, works fine!
The plotgraph function only works well with small graphs. It produces awful graphs when using more than four vertex. The toolbox could come with some function to format the data. I used one called cedge.m which worked well. Also, to use this toolbox you will need to install at least arrow.m.
I think, the Optimization Toolbox is required. The function MaxFlows for example is not running here, because 'linprog' doesn't exist.