1 files changed, 22 insertions, 0 deletions
diff --git a/3889/CH5/EX5.8/Ex5_8.sce b/3889/CH5/EX5.8/Ex5_8.sce
new file mode 100644
index 000000000..ddc724253
--- /dev/null
+++ b/3889/CH5/EX5.8/Ex5_8.sce
@@ -0,0 +1,22 @@
+//Example 5.8
+//page 326
+//Control Systems: Principles and Design 
+//M Gopal, Second Edition, Tata McGraw-Hill
+//Chapter:Concepts of Stability: Routh Stability Array
+
+xdel(winsid())//close all graphics Windows
+clear;
+clc;
+//transfer function
+//substitution of s-1 for s
+s=poly(1,'s');
+P= s^3 +7*s^2 +25*s +39;
+//routh array
+r=routh_t(P)
+disp(r,"Routh Array")
+[r,num]=routh_t(1/P,20)
+if num==0
+   disp("As all the elements in first column are positive,roots of characteristic polynomial are more negative than -1 ")
+else
+   mprintf("There is %g sign changes in entries of first column.\nTherefore, characteistic polynomial has some roots relatively unstable with respect to s=-1", num)
+end