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);
  x  v7 f. e4 I5 Oylin = linspace(min(y),max(y),30);
2 x, i. D5 x" z1 \8 x[X,Y] = meshgrid(xlin,ylin);
1 q) ~; G9 b9 x7 w* z+ X& tZ=griddata(x,y,z,xlin,ylin,'cubic');
, C1 d, V7 `8 I, ^mesh(X,Y,Z) %interpolated
" C  U+ t  n0 i9 Y. _axis tight; hold on
plot3(x,y,z,'.','MarkerSize',15) %nonuniform

输入后会出现如下提示：
Error in ==> delaunayn at 81
t = qhullmx(x', 'd ', opt);
- m8 B& Q0 b+ G9 l2 O% P" fError in ==> griddata>cubic at 168
    tri = delaunayn([x(:) y(:)]);
, g# n( n. H  ~% lError in ==> griddata at 92
    zi = cubic(x,y,z,xi,yi,opt);
& s) N/ I/ z: b$ W+ F1 _" rError in ==> aa at 7
+ I$ f+ r9 {8 m5 ^Z=griddata(x,y,z,xlin,ylin,'cubic');
7 \! w! a, K' y) B