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);
- W+ }/ ^* ?; f2 I1 p, ^6 n* ^z = A(:,3);
xlin = linspace(min(x),max(x),30);
- t2 H  C+ d* l$ _" hylin = linspace(min(y),max(y),30);
+ R' Q, j1 o# }6 Q0 \% g[X,Y] = meshgrid(xlin,ylin);
Z=griddata(x,y,z,xlin,ylin,'cubic');
. N" b0 m8 ]  q' ]mesh(X,Y,Z) %interpolated
' @5 S. c1 W" A7 B* z. Z9 f; |axis tight; hold on
- N# \- z* p* s2 E7 q' W" `8 Fplot3(x,y,z,'.','MarkerSize',15) %nonuniform
. ]# c2 D" G& Z  ?: W- i
4 h9 J& p2 z2 L  _  k: |输入后会出现如下提示：
Error in ==> delaunayn at 81
6 j1 R7 {1 z+ ~5 i- s6 X6 Et = qhullmx(x', 'd ', opt);
Error in ==> griddata>cubic at 168
    tri = delaunayn([x(:) y(:)]);
4 _1 A/ t) l' P5 F9 ]/ `  f% i- CError in ==> griddata at 92
    zi = cubic(x,y,z,xi,yi,opt);
+ C! I: M/ y& v# `+ LError in ==> aa at 7
Z=griddata(x,y,z,xlin,ylin,'cubic');
# r* r4 r' T4 o) z$ n0 q