Question

MATLAB二维插值会出现报错

x=[0,0.2,0.23,0.5,0.56,0.78,0.8,0.9,0.91,0.94,0.99];
y=[0,20,50,70,83,99,103,105,117,118,119];
z=[2,7,0,3,5,6,7,2,1,12,4];
xx=0:0.01:1;
yy=0:2:200;
v=interp2(x,y,z,xx,yy,'spline')

??? Error using ==> polyfun\private\chckxy
There should be at least two data points.

Error in ==> spline at 55
[x,y,sizey,endslopes] = chckxy(x,y);

Error in ==> splncore>splint at 121
[ignored,coefs,l,k,d] = unmkpp(spline(x,y));

Error in ==> splncore at 62
values = splint(x{i},reshape(values,prod(nv(1:d-1)),nv(d))).';

Error in ==> interp2>spline2 at 585
F = splncore(varargin(2:-1:1),varargin{3},varargin(5:-1:4));

Error in ==> interp2 at 230
zi = spline2(x,y,z,xi,yi,ExtrapVal);
请问程序是哪里出了什么问题？

Answer 1

MATLAB二维插值会出现报错的原因是，z没有对应x，y二维数表（即水平方向为x数据，垂直方向为y数据），如x为m行向量，y为n列向量，则z为m×n向量

【扩展资料】

Vq = interp2(X,Y,V,Xq,Yq)的含义是，使用线性插值返回双变量函数在特定查询点的插入值。结果始终穿过函数的原始采样。X 和 Y 包含样本点的坐标。V 包含各样本点处的对应函数值。Xq 和 Yq 包含查询点的坐标。