Question about adjacent matrix of a network using MATLAB

I would like to know how to using the plot function to show the relationship of an adjacent matrix.It means if I want to connect a matrix, 1 means connected and 0 means no connection. Example, a matrix like this 0 1 0 1 1 0 1 1 0 0 1 0 1 0 0 0 0 0 1 0 0 1 0 0 0 0 0 1 0 1 1 0 0 0 1 0 0 0 0 1 1 0 0 1 0 1 0 0 0 0 0 0 0 0 1 0 1 1 0 0 1 0 0 0 0 1 0 0 1 0 1 0 1 0 0 1 0 0 1 1 0 1 0 0 0 0 1 1 0 0 0 0 1 1 0 0 0 1 0 0

I would like to know how to connect those node if they are connected.

[Paulo Silva]

Why do you accept your own answers? You are supposed to accept those answers who are most helpful, not your own extra information!

[yuen]

ha..i make an mistake~

Answer 1

[Paulo Silva]

spy([0     1     0     1     1     0     1     1     0     0
   1     0     1     0     0     0     0     0     1     0
   0     1     0     0     0     0     0     1     0     1
   1     0     0     0     1     0     0     0     0     1
   1     0     0     1     0     1     0     0     0     0
   0     0     0     0     1     0     1     1     0     0
   1     0     0     0     0     1     0     0     1     0
   1     0     1     0     0     1     0     0     1     1
   0     1     0     0     0     0     1     1     0     0
   0     0     1     1     0     0     0     1     0     0])

[yuen]

first,thank you for your response.

however, I would like to know how to connect the node if they are connected?

[yuen]

if it is 1, then use a line to make a connection, if 0,no connection. I would like to know how to show it out by matlab? Can you help me? Thank you very much!!=]

[Paulo Silva]

coonected? how?

[yuen]

the matrix, 1 is means connection, 0 means no connection..do you understand my question?

[yuen]

for example, [0 1 0 1;1 0 1 1]

for the above matrix, for the first 1, (12) is connected. while (13) is zero, then no connection.

[yuen]

i would like to show it out by using the matlab function, but how? i have no ideas....

Answer 2

[Paulo Silva]

I wonder if it's this you want?!

%Your matrix is in variable a
hold on
drawlines=1; %1 to connect points where a equals 1
markpoints=0; %1 to mark points where a equals 1
for r=1:numel(a(:,1))
  for c=1:numel(a(1,:))
      y=numel(a(:,1))-r+1;
      x=c;
      if((r~=numel(a(:,1))) & (c~=numel(a(1,:))))
          if((a(r,c)==1) & (a(r+1,c+1)==1))
              if (drawlines==1)
                  line([x x+1],[y y-1])
              end
              if (markpoints==1)
              plot(x,y,'*')
              plot(x+1,y-1,'*')
              end
          end
      end
      if((c~=1) & (r~=numel(a(:,1))))
          if((a(r,c)==1) & (a(r+1,c-1)==1))
              if (drawlines==1)
                  line([x x-1],[y y-1])
              end
              if (markpoints==1)
              plot(x,y,'*')
              plot(x-1,y-1,'*')
              end
          end
      end
  end
end
axis([1 numel(a(1,:)) 1 numel(a(:,1))])

[yuen]

OH....really thank you very much!!!But.what factor you based on to plot such graph? becasue i am quite doubt about the result. The graph I plot is not i expected. can i send you a whole matlab script to have a look? I think the connection still have problems. sorry for causing you any inconvenience but i really need your help!

[Paulo Silva]

doc gplot

[yuen]

what doc gplot?

[yuen]

hi, i would like to seek your help on the matlab program you have written before, hope you can spend little time.. thanks..