为scatter3图创建图例(Matlab) [英] creating legend for scatter3 plot (Matlab)

问题描述

我在3维上有一个矩阵点X(X是Nx3矩阵)，这些点属于簇.它所属的簇由Nx1向量Cluster给出(它的值类似于1,2,3，...).因此，我将其绘制在scatter3上，如下所示:

I have a matrix points X in 3 dimensions (X is a Nx3 matrix) and those points belong to clusters. The cluster it belongs is given by the Nx1 vector Cluster (it has values like 1,2,3,...). So, I am plotting it on scatter3 like this:

scatter3(X(:,1),X(:,2),X(:,3),15,Cluster)

它工作正常，但我想在其中添加图例，以显示彩色标记和它代表的群集.

It works fine, but I would like to add a legend to it, showing the colored markers and the cluster it represents.

例如，如果我有3个群集，我希望有一个图例:

For example, if i have 3 clusters, I would like to have a legend like:

<blue o> - Cluster 1
<red o> - Cluster 2
<yellow o> - Cluster 3

非常感谢您的帮助！

推荐答案

我建议您使用plot3，而不是使用scatter3，这将使标记更加简单:

Instead of using scatter3, I suggest you use plot3, which will make labeling much simpler:

%# find out how many clusters you have
uClusters = unique(Cluster);
nClusters = length(uClusters);

%# create colormap
%# distinguishable_colormap from the File Exchange 
%# is great for distinguishing groups instead of hsv
cmap = hsv(nClusters);

%# plot, set DisplayName so that the legend shows the right label
figure,hold on
for iCluster = 1:nClusters
    clustIdx = Cluster==uClusters(iCluster);
    plot3(X(clustIdx,1),X(clustIdx,2),X(clustIdx,3),'o','MarkerSize',15,...
       'DisplayName',sprintf('Cluster %i',uClusters(iCluster)));
end

legend('show');

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