1 files changed, 27 insertions, 0 deletions
diff --git a/257/CH8/EX8.31/example_8_31.sce b/257/CH8/EX8.31/example_8_31.sce
new file mode 100644
index 000000000..c1aaabd74
--- /dev/null
+++ b/257/CH8/EX8.31/example_8_31.sce
@@ -0,0 +1,27 @@
+syms s K
+G=(10+s)*K/(s^2*(s^2+2*s+10))
+H=1
+
+Ka=limit(s^2*G*H,s,0)
+disp(Ka, " Ka = ")
+Ess=0.1        //given
+K=1/Ess           //A=1
+disp(K,"K=")
+
+s=%s
+F=s^4+2*s^3+10*s^2+10*s+100
+
+disp(routh_t(F)) 
+r=coeff(F)
+routh=routh_t(F)
+n=length(r)
+c=0;
+for i=1:n
+if (routh(i,1)<0)
+c=c+1;
+ end 
+  end
+  if(c>=1)
+    printf("system is unstable")
+  else printf("there are no roots on RHS")
+  end