Started statistics lecture

statistics-fabian/matlab/my_gradient_descent

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+param0 = [1,1];
+step = 0.01;
+
+m = 50;
+arange = linspace(0,1,m);
+brange = linspace(.5,1.5, m);
+
+[A,B] = meshgrid(arange, brange);
+
+E = 0*A;
+
+x = linspace(-5,5,20);
+y = .5*x + 1 + randn(1, length(x));
+
+U = 0*A;
+V = 0*A;
+
+
+for i = 1:m
+    for j = 1:m
+        E(i,j) = lserr([A(i,j), B(i,j)], x, y);
+        grad = lserr_gradient([A(i,j), B(i,j)], x, y);
+        U(i,j) = grad(1);
+        V(i,j) = grad(2);   
+        
+    end
+end
+colormap('jet');
+
+surf(A,B,E, 'FaceAlpha',.5);