Triplot Error

Hi

I wonder if anyone can help. I am trying to create a mesh to be used in a CFD program. However when I run my code I get the following error:

??? Index exceeds matrix dimensions.

Error in ==> triplot at 69
h = plot(x(d), y(d),c,varargin{start:end});

My code is as follows:

load nodes.txt
>> x=[nodes(:,1)];
>> y=[nodes(:,2)];
>> tri = delaunay(x,y);
>> triplot(tri,x,y);

    nodes.txt <973x2 double>
    x <973x1 double>
    y <973x1 double>
    tri <1818x3 double>

Any help you would be gratefully received

Thanks