Error in delaunayTriangulation function

Trying to implement the FEM i am using delaunayTriangulation to divide the space. I am getting an error:

Error using delaunayTriangulation

Invalid data format for delaunayTriangulation.

My code is:

X_select=[X_select;X_circulo'];
Y_select=[Y_select;Y_circulo'];
z=[X_select,Y_select];

figure(1)
plot ( z(:,1), z(:,2), 'b.','MarkerSize', 15 )
k = boundary(z,0.4);
hold on;
plot(X_select(k),Y_select(k),'g');
hold off
C=[X_select(k)';Y_select(k)'];
figure(2)
t = delaunayTriangulation(double(z),double(C));
triplot( t, z(:,1), z(:,2) );

the first section of the code is working properly.

What am i doing wrong?

Thanks in advance!

[KSSV]

what are the sizes of double(z),double(C) which you are sending to function? Are these numbers valid? Without data it is not easy for us to get the error.

[DDD]

>> size(z)

ans =

     489     2

>> size(C)

ans =

       2    84

I have also updated the question with fig1

Answer 1

[Carl]

Hi DDD, the constrained edges must be passed in as a 2-column matrix. Additionally, the values of those columns should be IDs of the vertices that define each edge, not the (x,y) values of the vertices themselves. See the documentation here:

http://www.mathworks.com/help/matlab/ref/delaunaytriangulation-class.html#input_argument_C

In your case, if you'd like to use the output of 'boundary' as constrained edges, you can construct C like so:

C=[k(1:end-1),k(2:end)];