这个插值代码到底哪里错了嘛

gaoyuan_1993

A=load('频率.txt');
x=A(:,1);y = A(:,2);
z = A(:,3);
. F7 F; U. ]  Q; t) jxlin = linspace(min(x),max(x),30);
ylin = linspace(min(y),max(y),30);
[X,Y] = meshgrid(xlin,ylin);
Z=griddata(x,y,z,xlin,ylin,'cubic');
mesh(X,Y,Z) %interpolated
axis tight; hold on
5 x0 i1 O* m+ ~; Rplot3(x,y,z,'.','MarkerSize',15) %nonuniform
+ y  g: }: Z5 E: O  p2 e
输入后会出现如下提示：
Error in ==> delaunayn at 81
; ~  j+ n: t, ht = qhullmx(x', 'd ', opt);
- g; F1 |6 U& @% t& `Error in ==> griddata>cubic at 168
) i5 b" r) d& R% Y4 ?% ^    tri = delaunayn([x(:) y(:)]);
Error in ==> griddata at 92
    zi = cubic(x,y,z,xi,yi,opt);
% p5 C% [6 D2 z; n, b4 fError in ==> aa at 7
Z=griddata(x,y,z,xlin,ylin,'cubic');
7 [4 e( O6 \. J