diff --git a/spring.m b/spring.m
new file mode 100644
index 0000000000000000000000000000000000000000..cb843e08fd4ff5069f2631345646838555ff28ab
--- /dev/null
+++ b/spring.m
@@ -0,0 +1,13 @@
+clear
+clc
+k1 = springstiff(200);
+k2 = springstiff(300);
+k3 = springstiff(400);
+k4 = springstiff(100);
+K = zeros(4);
+K([1,3],[1,3]) = K([1,3],[1,3]) + k1;
+K([1,2],[1,2]) = K([1,2],[1,2]) + k2;
+K([2,3],[2,3]) = K([2,3],[2,3]) + k3;
+K([3,4],[3,4]) = K([3,4],[3,4]) + k4;
+
+kread = K([2,3],[2,3]);
\ No newline at end of file