Question

我有3个系列数据： A = [1,1,1,1,2,2,3]; B = [52.97,52.92,51.78,55.66,50.45,50.23,53.02]; C = [0.7,0.7,0.7,0.7,0.8,0.8,0.5];

我想通过MATLAB通过这些数据绘制一个表面（C vs A和B）;我怎样才能做到这一点？

当我使用“[A，B，C] = meshgrid（a，b，c）; surf（A，B，C）”时，MATLAB会出错。请帮帮我。

Answer 1

函数griddata()可能会有所帮助。此功能可对3D空间中的散点进行插值。以下是使用三个向量a，b和c应用于您的示例的用法示例：

%generate a new mesh over coordinates a and b
st_a=(max(a)-min(a))/50;
st_b=(max(b)-min(b))/50;
[xq,yq]=meshgrid(min(a):st_a:max(a),min(b):st_b:max(b));

%do interpolation for c over the new mesh
vq = griddata(a,b,c,xq,yq);

%plot the surface
surf(xq,yq,vq)

Answer 2

您还可以使用scatteredInterpolant不仅可以插入数据，还可以对其进行外推。但是，您没有足够的数据点来进行有意义的插值/外推。

a=[1,1,1,1,2,2,3].';
b=[52.97,52.92,51.78,55.66,50.45,50.23,53.02].'; 
c=[0.7,0.7,0.7,0.7,0.8,0.8,0.5].';

F = scatteredInterpolant(a,b,c);

da = (max(a)-min(a))/100;
db = (max(b)-min(b))/100;

ta = min(a):da:max(a);
tb = min(b):db:max(b);

[aq,bq] = meshgrid(ta,tb);
cq = F(aq,bq);

figure
mesh(aq,bq,cq); 
hold on; 
plot3(a,b,c,'o'); 
hold off;

如何通过matlab通过3个数据矩阵绘制表面图？

2 个答案: