chore: import upstream snapshot with attribution

2026-07-13 13:30:25 +08:00
commit f19b2512d7
562 changed files with 38082 additions and 0 deletions
@@ -0,0 +1,37 @@
+function plotClass(X, label)
+% Plot 2d/3d samples of different classes with different colors.
+% Written by Mo Chen (sth4nth@gmail.com).
+[d,n] = size(X);
+if nargin == 1
+    label = ones(n,1);
+end
+assert(n == length(label));
+
+color = 'brgmcyk';
+m = length(color);
+c = max(label);
+
+figure(gcf);
+clf;
+hold on;
+switch d
+    case 2
+        view(2);
+        for i = 1:c
+            idc = label==i;
+%             plot(X(1,label==i),X(2,label==i),['.' color(i)],'MarkerSize',15);
+            scatter(X(1,idc),X(2,idc),36,color(mod(i-1,m)+1));
+        end
+    case 3
+        view(3);
+        for i = 1:c
+            idc = label==i;
+%             plot3(X(1,idc),X(2,idci),X(3,idc),['.' idc],'MarkerSize',15);
+            scatter3(X(1,idc),X(2,idc),X(3,idc),36,color(mod(i-1,m)+1));
+        end
+    otherwise
+        error('ERROR: only support data of 2D or 3D.');
+end
+axis equal
+grid on
+hold off