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

---
 40/CH9/EX9.5/Exa_9_5.sce | 12 ++++++++++++
 1 file changed, 12 insertions(+)
 create mode 100755 40/CH9/EX9.5/Exa_9_5.sce

(limited to '40/CH9/EX9.5')

diff --git a/40/CH9/EX9.5/Exa_9_5.sce b/40/CH9/EX9.5/Exa_9_5.sce
new file mode 100755
index 000000000..025deebe5
--- /dev/null
+++ b/40/CH9/EX9.5/Exa_9_5.sce
@@ -0,0 +1,12 @@
+//Mappings from difference algorithms
+//Backward difference mappings
+s=%s;z=%z;
+ts=1;a=1;
+HS=1/(s+a);
+HZa=horner(HS,(z-1)/(z*ts))
+z1=roots(denom(HZa))//for ts >0 HZa always stable
+HZb=horner(HS,(z-1)/ts)
+z2=roots(denom(HZb))//stable only for 0<ats<2
+HZc=horner(HS,(z^2-1)/(2*z*ts))
+z3=roots(denom(HZc))//magnitude of 1 pole is always>1 hence unstable
+
-- 
cgit