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

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Mohammad Bhat 2018-2-25

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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.....

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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"?

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Jan 2018-2-25

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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?

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Mohammad Bhat 2018-2-25

在 MATLAB Online 中打开

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....

Jan 2018-2-25

@Mohammad: You are welcome. The purpose of this forum is solving Matlab problem and this includes finding out, what the actual problems are.

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

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