How to form Adjacency matrix from CXX and CYY where CXX and CYY contains collectively some information??

7 次查看（过去 30 天）

Mohammad Bhat 2018-2-25

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/384657-how-to-form-adjacency-matrix-from-cxx-and-cyy-where-cxx-and-cyy-contains-collectively-some-informati

评论： Jan 2018-2-25

Hi, I have 100 x 100 binary image, I have made 2 x 2 grid on it, within each grid I am taking centre-of-mass of the white pixels if they have any white pixels else represent the grid as NaN.x-coordinate mean in CXX and Y coordinate mean in CYY.. To get a grph I am plotting :-

plot(CYY,CXX,'k*');

But I need Adjacency Matrix of a graph..How can I get that.....

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Jan 2018-2-25

I cannot follow your descriptions. Please post an example input and the code. "I have mad a grid" can mean a variety of procedures. What does "represent the grid as NaN" mean? With some code it would be clear, what you are doing. But is the explanation needed at all? Maybe it is enough to state, that you have two vectors X and Y which contain coordinates and want the corresponding adjacency matrix? Does it matter, where the coordinates are coming from or that they are called "CXX"?

请先登录，再进行评论。

请先登录，再回答此问题。

采纳的回答

Jan 2018-2-25

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/384657-how-to-form-adjacency-matrix-from-cxx-and-cyy-where-cxx-and-cyy-contains-collectively-some-informati#answer_306959

As posted in your other thread already, the methods shown here should solve your problem:

https://stackoverflow.com/questions/3277541/construct-adjacency-matrix-in-matlab

You have commented: "No help". So please explain, why these methods do not help you. What is the difference between these solutions and what you need?

12 个评论
显示 10更早的评论隐藏 10更早的评论

Mohammad Bhat 2018-2-25

Here is my code and I have attached figures:-

X = imread('e.jpg');

b = imresize(X,[100,100]);

% Binarization

th = graythresh(b);

I = im2bw(b,th);

% %thinning

kl=bwmorph(~I,'thin',inf);

%grid size

t1 = 5; % Grid Size choosen by USER we have fixed it 5 x 5

D = 100; % Height 5 and Breadth 5 of each grid in image Image

I = 1; % fix it 1

U1 = t1; % asign 5 to U1

J = 1; % FIX IT 1

U2 = t1; % assign 5 to U2

E = 1; % assign 1 to E

t2 = D/t1; % grid the 100 x 100 image into 5 x 5 therefore t2 = 20

%Z=1;

for iir=1:t2 %

    for jjr=1:t2  %    
 B(I:U1,J:U2)=R(I:U1,J:U2);   %     1 to 5 and 1 to 5

% vc=sum(B(I:U1,J:U2));

% Fd=sum(vc);

 [x,y]=find(B==1);
 CX=mean(x);
 CY=mean(y);
 CXXX(E)=CX;
 CYYY(E)=CY;
 CXX(iir,jjr)=CX;
 CYY(iir,jjr)=CY;
      T(I:U1,J:U2)=B(I:U1,J:U2);
      J=J+t1;
      U2=U2+t1;
E=E+1;
   clear B x y 
      end

I=I+t1;

U1=U1+t1;

J=1;

U2=t1;

end

%plot and grid

%figure,imshow®

hold on

M10 = size(R,1);

N10 = size(R,2);

a=t1;

b=t1;

for k = 1:a:M10

    x = [1 N10]; 
   y = [k k]; 
    plot(x,y,'Color','white');
    set(findobj('Tag','MyGrid'),'Visible','on')

end

for k = 1:b:N10

    x = [k k]; 
    y = [1 M10];
    plot(x,y,'Color','white');
    set(findobj('Tag','MyGrid'),'Visible','on')

end

z = imread('empty.jpg');

r = imresize(z,[50,50]);

%figure,imshow(r);

hold on

%baseFileName = sprintf('figure_%d.jpg',k);

%set(0, 'DefaultFigureVisible', 'off');

plot(CYY,CXX,'k*');

Mohammad Bhat 2018-2-25

Sir, I went thru your suggestion,since I am new to this forum,I will not repreat mistakes,I got the desired Adjacency matrix,.....Thank you all for patience and tolerance....