请问怎么查看cftool工具箱拟合出的曲面的数据呢？（curve fitting tool）

Question

比如我在xyz坐标系拟合出了一个曲面，想查看这个曲面的z轴最大值，并找到他的位置，这该如何实现呢？

Answer 1

工具箱生成的数值都可以从命令行直接获取：

E=rand(3);%E你自己取
[X,Y] = meshgrid(1:3);
[xData, yData, zData] = prepareSurfaceData( X, Y, E );
% Set up fittype and options.
ft = 'biharmonicinterp';
% Fit model to data.
[fitresult, gof] = fit( [xData, yData], zData, ft, 'Normalize', 'on' );
% Plot fit with data.
figure( 'Name', 'untitled fit 1' );
h = plot( fitresult, [xData, yData], zData );

% Label axes
xlabel X
ylabel Y
zlabel E
grid on
view( -20.0, 6.3 );
[X,Y] = meshgrid(1:0.01:3);
Z = fitresult(X,Y);
[~,I] = maxk(Z(:),1);
hold on
h(3)=plot3(X(I),Y(I),Z(I),'ro','markersize',14,'markerfacecolor','r');
legend( h, 'untitled fit 1', 'E vs. X, Y','最大值', 'Location', 'NorthEast' );
fprintf('X=%f,Y=%f,Zmax=%f\n',X(I),Y(I),Z(I))

最后类似于这种，有帮助望采纳呢

Answer 2

E=zeros(9);
E=kk1(row-1:row+1,col-1:col+1)
[X,Y] = meshgrid(1:3);
[xData, yData, zData] = prepareSurfaceData( X, Y, E );

% Set up fittype and options.
ft = 'biharmonicinterp';

% Fit model to data.
[fitresult, gof] = fit( [xData, yData], zData, ft, 'Normalize', 'on' );

% Plot fit with data.
figure( 'Name', 'untitled fit 1' );
h = plot( fitresult, [xData, yData], zData );
legend( h, 'untitled fit 1', 'E vs. X, Y', 'Location', 'NorthEast' );
% Label axes
xlabel X
ylabel Y
zlabel E
grid on
view( -20.0, 6.3 );
[~,I] = maxk(E(:),1);