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);
9 U: U- f7 c  F2 M' b- N[X,Y] = meshgrid(xlin,ylin);
Z=griddata(x,y,z,xlin,ylin,'cubic');
$ N5 r+ D' _- ~5 ~, I# Vmesh(X,Y,Z) %interpolated
axis tight; hold on
plot3(x,y,z,'.','MarkerSize',15) %nonuniform
$ P3 R8 D: s" T9 q, k
+ S* u5 [# _8 T) j+ m' ~输入后会出现如下提示：
2 c. W# J! I( o6 F- Q8 bError in ==> delaunayn at 81
, e+ V' l) g. E2 ^+ qt = qhullmx(x', 'd ', opt);
  n& X, q9 {. Y& S; eError in ==> griddata>cubic at 168
* Y; O' e: N, ]    tri = delaunayn([x(:) y(:)]);
0 v) S+ D( A* ~) s9 O/ M+ m6 XError in ==> griddata at 92
% u( }1 N4 q+ S& w    zi = cubic(x,y,z,xi,yi,opt);
/ c. h  E5 z+ n8 I5 c% _1 Z, h/ m6 vError in ==> aa at 7
Z=griddata(x,y,z,xlin,ylin,'cubic');
4 |$ S0 r6 t3 b6 `6 |4 S0 s# P