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);
6 q  ~7 g# R& C  K1 [; ?) [9 u) kxlin = linspace(min(x),max(x),30);
ylin = linspace(min(y),max(y),30);
: o$ c* m  J! V, Z3 z' k. o[X,Y] = meshgrid(xlin,ylin);
Z=griddata(x,y,z,xlin,ylin,'cubic');
mesh(X,Y,Z) %interpolated
: k) V- \( t5 r/ k! S: daxis tight; hold on
$ c- @$ Q9 J) w$ Z- X" \plot3(x,y,z,'.','MarkerSize',15) %nonuniform

输入后会出现如下提示：
& ^# a  ~8 L9 T! P0 x. a+ |2 UError in ==> delaunayn at 81
' \% k6 a, h' w7 r# Jt = qhullmx(x', 'd ', opt);
' R/ X) B+ {$ w  a- v" i8 EError in ==> griddata>cubic at 168
    tri = delaunayn([x(:) y(:)]);
Error in ==> griddata at 92
$ Z( O' C4 o2 j6 `/ Q5 N: U    zi = cubic(x,y,z,xi,yi,opt);
2 U: y$ m3 L' }" u* k+ S  B& nError in ==> aa at 7
Z=griddata(x,y,z,xlin,ylin,'cubic');