Error in delaunayTriangulation function

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DDD
DDD 2017-3-31
回答： Carl 2017-4-3
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!
  2 个评论
KSSV
KSSV 2017-3-31
编辑：KSSV 2017-3-31
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
DDD 2017-3-31
>> size(z)
ans =
489 2
>> size(C)
ans =
2 84
I have also updated the question with fig1

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回答（1 个）

Carl
Carl 2017-4-3
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)];

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