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);
xlin = linspace(min(x),max(x),30);
ylin = linspace(min(y),max(y),30);
* F6 {& o0 x7 L8 R& B: x[X,Y] = meshgrid(xlin,ylin);
Z=griddata(x,y,z,xlin,ylin,'cubic');
% r- s% ^7 s/ E. L% t4 c; S: ]mesh(X,Y,Z) %interpolated
, F: k5 U+ U0 Aaxis tight; hold on
9 d$ p5 X- v8 H2 f. Kplot3(x,y,z,'.','MarkerSize',15) %nonuniform

5 x6 `2 t6 y. x输入后会出现如下提示：
) G( B* ~4 A% AError in ==> delaunayn at 81
t = qhullmx(x', 'd ', opt);
Error in ==> griddata>cubic at 168
9 f. y" p$ P9 ~8 S  U) i    tri = delaunayn([x(:) y(:)]);
$ ~, ^1 S) l: |( FError in ==> griddata at 92
    zi = cubic(x,y,z,xi,yi,opt);
4 y& D# B2 j) `/ ]9 pError in ==> aa at 7
Z=griddata(x,y,z,xlin,ylin,'cubic');
* \0 l- Q6 v' v& f' x: |9 B8 z