如何在 3D 图中用不同颜色绘制单元格中的每个矩阵？

Question

考虑一个 1x3 单元格 A:

A = { [A1] [A2] [A3] } 
A = {[1 2 3; 4 5 6; 7 8 9] [6 5 4; 9 8 7] [1 1 1]}

Ai 的结构是这样的：

A1 = [ 1 2 3    %coordinate (x,y,z) of point 1  
       4 5 6    %coordinate (x,y,z) of point 2  
       7 8 9 ]  %coordinate (x,y,z) of point 3 

A2 = [ 6 5 4    %coordinate (x,y,z) of point 4  
       9 8 7 ]  %coordinate (x,y,z) of point 5  

A3 = [ 1 1 1 ]  %coordinate (x,y,z) of point 6

如何绘制所有这些点，以便我们对 A1 的所有点使用一种颜色，A2 的所有点使用另一种颜色，A2 的所有点使用另一种颜色 A3?

一般来说，如果我们有一个 1xn 的单元格，即 A = { [A1] [A2] [A3] ... [An] }，该怎么做？

Answer 1

连接元胞数组 A vertically. Use jet or any other colormap to generate different colours for different matrices. Find the number of points in each matrix inside A to determine number of times each colour will be repeated. Generate number of copies of each colour accordingly and finally use scatter3 内的所有矩阵以绘制这些点。

newA = vertcat(A{:});                    %Concatenating all matrices inside A vertically

colours = jet(numel(A));                 %Generating colours to be used
colourtimes = cellfun(@(x) size(x,1),A); %Determining num of times each colour wil be used
colourind = zeros(size(newA,1),1);       %Zero matrix with length equals num of points
colourind([1 cumsum(colourtimes(1:end-1))+1]) = 1;
colourind = cumsum(colourind);           %Linear indices of colours for newA

scatter3(newA(:,1), newA(:,2), newA(:,3),[], colours(colourind,:),'filled');

对于给定的 A，上面的代码产生了这个结果：

如何在 3D 图中用不同颜色绘制单元格中的每个矩阵？

How to plot each matrix in a cell with a different color in a 3D plot?

matlab

plot

colors

matlab-figure