Octave：绘制3D插值的结果

Question

我想绘制一个表面，其高程是分散数据上3D插值的结果： 我有三个列向量中的坐标x，y，z和标量值v。我想插入v，例如，一个常数x平面，坐标为xi，yi，zi，获得vi，最终绘制表面（yi，zi，vi）。 我怎么能这样做？

Answer 1

这是我找到的解决方案，感谢andy1978在#octave irc频道和Nicola：

x1 = linspace (min(x),max(x),50) ;
y1 = linspace (min(y),max(y),50) ;
z1 = linspace (min(z),max(z),50) ;
[xx, yy, zz] = meshgrid (x1, y1, z1) ;

vv = griddata3 (x, y, z, v, xx, yy, zz ) ;

x0 = 0.05 ;   % constant x of chosen plane

[~,i] = min (abs (x - x0)) ;

vv_sect = vv (:, i, :) ;      % here I slice the matrix of interpolated results at x=x0
vv_out = squeeze (vv_sect) ;  % and this is what I needed to reduce the dimensionality of
                              % the sliced matrix

[yy2,zz2] = meshgrid (y1, z1) ;

surf (yy2, zz2, vv_out ) ;