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 +1,33 @@
+function plotkde(X, sigma2)
+% Plot 2d kernel density.
+% Written by Mo Chen (sth4nth@gmail.com).
+if nargin < 2
+    sigma2 = 1e-1;
+end
+level = 64;
+n = 256;
+
+X = standardize(X);
+
+spread(X);
+x_range = xlim;
+y_range = ylim;
+
+x = linspace(x_range(1),x_range(2), n);
+y = linspace(y_range(2),y_range(1), n);
+
+[a,b] = meshgrid(x,y);
+
+z = exp(logkdepdf([a(:)';b(:)'],X,sigma2));
+
+z = z-min(z);
+z = floor(z/max(z)*(level-1));
+
+figure;
+image(reshape(z,n,n));
+colormap(jet(level));
+set(gca, 'XTick', [1 256]);
+set(gca, 'XTickLabel', [min(x) max(x)]);
+set(gca, 'YTick', [1 256]);
+set(gca, 'YTickLabel', [min(y) max(y)]);
+axis off