how get graph?

hi if I have data show users nd the relationships with other users, are there any way by which can draw such graph?

thanks in advance, huda

Answer 1

[Image Analyst]

I think you should know this, but I'll just throw out a wild guess: a scatter plot? If that's not what you want then you need to be more descriptive. These may help with that:

http://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer

http://www.mathworks.com/matlabcentral/answers/8626-how-do-i-get-help-on-homework-questions-on-matlab-answers

The "gray level co-occurrence matrix" (performed by the graycomatrix function in the Image Processing Toolbox) is one way of seeing relationships such as this where you want to see the relationship between every item and every other item. It's an image of "connection weights" though (like how many times those items occur together as a pair), rather than a graph-theory type of node diagram. It may or may not be helpful to you, since I tend to look at things through "imaging glasses." For example:

% Create sample data.
m = uint8([1,100;1,3;1,10;2,100;3,2;3,4])
% Computer glcm matrix.
gcm = graycomatrix(m, 'numlevels', 255)
imshow(gcm, []);
axis on;
title('Gray Level Co-occurrence Matrix', 'Fontsize', 30);
xlabel('Column 1 Value', 'Fontsize', 30);
ylabel('Column 2 Value', 'Fontsize', 30);
% Enlarge figure to full screen.
set(gcf, 'units','normalized','outerposition',[0 0 1 1]);

glcm is like a scatterplot where the intensity of the dots depends on the frequency of occurrence of that pair.

Answer 2

[Walter Roberson]

This sounds like a traditional kind of graph-theory plot. Unfortunately once you get to about 6 nodes, you cannot necessarily draw the result as a planar graph, so you are going to have to be more specific about how you want the graphs drawn.

[huda nawaf]

simple graph , just to see the structure of relations

but of course i have large size of users

thanks

[huda nawaf]

walter, if i have txt file as

1 3 4 5 100

2 6 2 1 70 9

3 7 .........

.

.

etc

the first column of this txt file represent id of user and the other columns are friends of this user.

Now, i want graph show this relationships

thanks

[Walter Roberson]

You had better refer us to a sample of what you want the plot to look like.

[huda nawaf]

ex.

sorce target

1 5

1 3

2 100

2 10

2 3

etc

these numbers are represent nodes of id's for users, i want graph show these relationships.

[Walter Roberson]

Please, a link to a sample plot. I could whip up code for plotting the information you have given, but that isn't going to do you any good if _my_ idea of what it is acceptable to look like, looks nothing like _your_ idea of what it must look like.

http://www.mathworks.com/matlabcentral/answers/7924-where-can-i-upload-images-and-files-for-use-on-matlab-answers

[huda nawaf]

u can see this link to get idea of what i need

http://www.orient-lodge.com/node/3408

this software need programming

this is just example .

i deal with txt file in which two columns , the first one represent source node:

ex.

1

1

1

2

3

3

the second one is target node

100

3

10

100

2

4

there are edges between source node and target node (users)

ex. 1 is friend of 100 ,3 and 10, so there is edges between them and so for other users

many thanks walter

[Walter Roberson]

Yes, I understand your input, you do not need to repeat that.

Your input has relations between multiple nodes to multiple nodes, with none of the nodes being more important or the "center" of the graph. Your example graphs, however, have only one main node with connections to several other nodes, and has no examples of additional connections.

You need to give us an example of how you want your multiple-nodes to multiple-nodes to look. It makes big differences in the graphs. There are substantial differences in how one might place the nodes, and how one might arrange the multiple connections. How one is to deal with potentially crossing edges is quite important: the algorithms to avoid crossing edges get fairly complex.

[huda nawaf]

I have not central node .

I just need see the structure of networks of relations .

I have large set of users , and important for me to see the relations among them.

walter, may be find out many things after see the networks of relations.

I need simple graph.

thanks

[Walter Roberson]

Let SRC be a *column* vector of the source nodes. Let TARG be a *column* vector of the target nodes.

plot( ones(size(SRC)), [SRC, TARG].' )

Of course, this will plot everything in a single column, and the lines will overlap each rather other badly.

If this wasn't what you wanted, you should have given an example of what you did want, and someone else will have to help you with it, as 3 times asking for an example is the limit of my patience.

[Walter Roberson]

Note: I do not download files sent to me without warning, as I get many attempts to get me to read Nigerian scam messages and attempts to get me to download malware.

If I were to be sent a sample graph or problem document related to this thread, I probably wouldn't look at it, as I am already out of patience. Someone could, however, post a link to an image or document as someone else might look at it.

http://www.mathworks.com/matlabcentral/answers/7924-where-can-i-upload-images-and-files-for-use-on-matlab-answers

[Oleg Komarov]

@Walter: your help is much needed in places where (at least) effort is.

[Geoff]

Sounds like the required solution to this problem is to write a program which generates a GraphViz script, then install GraphViz and run the script.

[huda nawaf]

thanks for advice,

i did but with gephi software, no need a script

Answer 3

[Christine Tobler]

Since MATLAB R2015b, there are Graph and Network Algorithms in MATLAB that will allow you to construct and plot a graph of these relationships. Several layout options are available, using plot(mygraph, 'Layout', 'force'), for example.