MATLAB: Storing a vector as a row of a matrix

matrix manipulation

How would one store different vectors as different rows of a matrix?

eg in this case

   for ii=1:16
       A(ii)=0;
       C(ii)=0;
       for jj=1:4
           for kk=1:8
               A(ii)=A(ii)+hd(jj)*delta_edp(ii,jj,kk);
              Ae(ii,:)=A(ii);
               X(ii,:)= X_dp(jj,kk);
               X(ii,:)=ro_max;
              Aeq(ii,:)=Ae(ii)*X(ii);
           end
       end

Best Answer

N = 12;
x = rand(1,N);
y = rand(1,N);
z = rand(1,N);
A = [ x ; y ; z ] ;

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MATLAB: Error using Reshape pls help

How many elements are in l_dp before you try to reshape it? To reshape it into a 4 x 8 arrangement, numel(l_dp) must equal 32. Here's an example

a = magic(6)

Above, a is 6-by-6 and thus has as 36 elements. You can reshape a into a 4-by-9 matrix by

a = reshape(a,4,9)

because 4 times 9 is 36, meaning there's you're not trying to change the number of elements in a when you reshape it. If you try to reshape a into a 4-by-8 matrix, it'll give you an error:

reshape(a,4,8)
Error using reshape
To RESHAPE the number of elements must not change.

MATLAB: Plotting a 3D matrix graph

First, I assume that the graph is undirected, edges are going both ways, but you might want to change that maybe.

A = zeros(13, 13); %adjacency matrix, assume undirected graph
link(1,:)=[1 2];
link(2,:)=[1 3];
link(3,:)=[1 4];
link(4,:)=[2 6];
link(5,:)=[3 6];
link(6,:)=[3 7];
link(7,:)=[4 8];
link(8,:)=[4 9];
link(9,:)=[6 10];
link(10,:)=[7 10];
link(11,:)=[8 11];
link(12,:)=[8 12];
link(13,:)=[9 12];
link(14,:)=[9 13];
link(15,:)=[1 5];
link(16,:)=[5 13];
nlinks  = length(link);
inds    = sub2ind(size(A), link(:,1), link(:,2)) %convert to index in the adjacency matrix
A(inds) = 1; %the points are connected
%Making A symmetric (undirected graph)
A = triu(A, 1);
A = A + A';
%Positioning the nodes in a circle
theta = linspace(0, 2*pi, nlinks);
x     = cos(theta);
y     = sin(theta);
gplot(A, [x' y'], 'o-')
hold on
%Put text at the nodes
scale = 1.07; %radius of the text positions
for i = 1:size(A,1)
      if sum(A(i,:)) > 0 %if there are any links
          text(scale*x(i), scale*y(i), num2str(i), 'fontsize', 16,...
              'HorizontalAlignment', 'center')%num2str(nums(i)))
      end
  end
axis([-1.1,1.1,-1.1,1.1])

So, I first create a adjacency matrix from the links you provided. Then I give gplot the coordinates to the node positions using a circle, that just seemed to work in this case. If you wish to place the nodes in another position you can give other coordinates to x and y.

I also added text at the node positions so you can easily check that it is correct.

Best Answer

Related Solutions

MATLAB: Error using Reshape pls help

MATLAB: Plotting a 3D matrix graph

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