how get graph?
显示 更早的评论
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
回答（3 个）
Image Analyst
2012-4-20
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:
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.
Walter Roberson
2012-4-20
0 个投票
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.
13 个评论
huda nawaf
2012-4-21
huda nawaf
2012-4-21
Walter Roberson
2012-4-21
You had better refer us to a sample of what you want the plot to look like.
huda nawaf
2012-4-21
Walter Roberson
2012-4-21
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
2012-4-21
Walter Roberson
2012-4-21
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
2012-4-22
Walter Roberson
2012-4-22
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
2012-4-22
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
2012-4-22
@Walter: your help is much needed in places where (at least) effort is.
Geoff
2012-4-23
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
2012-4-24
Christine Tobler
2019-11-22
0 个投票
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.
类别
在 帮助中心 和 File Exchange 中查找有关 Graphics Performance 的更多信息
2012-4-20
2019-11-22
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
