init bruv

LU.m

@@ -0,0 +1,32 @@
+
+
+
+# upper matrix ballocks.
+clear,clc
+#U2 = -A(2,1)/A(1,1) * A(1, :) + A(2, :)
+#U3 = -A(3,1)/A(1,1) * A(1, :) + A(3, :)
+#U_temp = [A(1,:); U2; U3]
+#U3 = -A(3,2)/U_temp(2,2) * U_temp(2, :) + U_temp(3, :)
+#U = [A(1,:); U2; U3]
+#L = [1, 0, 0; A(2,1)/A(1,1),1,0;(A(3,1)/A(1,1)),(A(3,2)/U_temp(2,2)),1]
+
+# U_temp var = A (matrix)
+# for i < n
+# j = i + 1
+	# for j <= n
+	# U_temp(j, :) = -U_temp(j,i)/U_temp(j,i) * U_temp(i, :) + U_temp(j, :)
+
+	A = [5,2,4;2,1,1;1,-5,-3];
+	b = [17;0;13;];
+	U_temp = A
+	L_temp = eye(3);
+	for i = [1:length(A)-1]
+		for j = [i+1: length(A)]
+			L_temp(j,i) = U_temp(j,i)/U_temp(i,i);
+			U_temp(j, :) = -U_temp(j,i)/U_temp(i,i) * U_temp(i, :) + U_temp(j, :);
+		endfor
+	endfor
+	U_temp
+	L_temp
+#another for loop that's like we create another matrix for Z
+L_temp*U_temp\b