From b1f5c3f8d6671b4331cef1dcebdf63b7a43a3a2b Mon Sep 17 00:00:00 2001
From: priyanka
Date: Wed, 24 Jun 2015 15:03:17 +0530
Subject: initial commit / add all books

---
 75/CH9/EX9.2/ex_2.sce | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100755 75/CH9/EX9.2/ex_2.sce

(limited to '75/CH9/EX9.2/ex_2.sce')

diff --git a/75/CH9/EX9.2/ex_2.sce b/75/CH9/EX9.2/ex_2.sce
new file mode 100755
index 000000000..2d28eadd5
--- /dev/null
+++ b/75/CH9/EX9.2/ex_2.sce
@@ -0,0 +1,25 @@
+        // PG 591
+
+n = 4
+A = [4 1 0 0;1 4 1 0;0 1 4 1;0 0 1 4]
+lam = spec(A)
+
+//    Since A is symmetric, all eigen values are real.
+//    The radii are all 1 or 2.
+//    The centers of all the circles are 4.
+//    All eigen values must all lie in the interval [2,6]
+//    Since the eigen values of inv(A) are the reciprocals of those of A,
+//    1/6 <= mu <= 1/2
+
+//    Let inv(A) = B
+
+B=inv(A);
+norm(B,2)
+n
+i = 1:n;
+j = 1:n;
+
+    //    for j~i
+    //        r = sum(abs(B(i,j)))
+
+//    norm(B,2) = r(B) <= o.5
\ No newline at end of file
-- 
cgit