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);
* W8 M9 W1 H- y6 _  t7 sz = A(:,3);
xlin = linspace(min(x),max(x),30);
, U1 r. k5 O$ `6 Qylin = linspace(min(y),max(y),30);
[X,Y] = meshgrid(xlin,ylin);
1 D5 P  |" K# F; M( c7 l' e6 MZ=griddata(x,y,z,xlin,ylin,'cubic');
mesh(X,Y,Z) %interpolated
' }- }2 e6 l. h7 n6 I+ f& Haxis tight; hold on
plot3(x,y,z,'.','MarkerSize',15) %nonuniform
$ T8 e" Y1 h, G5 t* y
输入后会出现如下提示：
Error in ==> delaunayn at 81
6 G' I2 r+ i( e4 N6 ?3 N: [t = qhullmx(x', 'd ', opt);
Error in ==> griddata>cubic at 168
    tri = delaunayn([x(:) y(:)]);
+ b; j& W7 s" o6 x' Q5 AError in ==> griddata at 92
! X% c: v4 f; m/ w6 t    zi = cubic(x,y,z,xi,yi,opt);
Error in ==> aa at 7
2 ]9 M* w. A6 i6 T3 l. t  C$ F0 DZ=griddata(x,y,z,xlin,ylin,'cubic');