1 files changed, 23 insertions, 0 deletions
diff --git a/257/CH8/EX8.19/example_8_19.sce b/257/CH8/EX8.19/example_8_19.sce
new file mode 100644
index 000000000..f3b367aea
--- /dev/null
+++ b/257/CH8/EX8.19/example_8_19.sce
@@ -0,0 +1,23 @@
+s=%s
+F=s^6+2*s^5+5*s^4+8*s^3+8*s^2+8*s+4
+
+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
+       disp("s^2 is")
+       k=(roots(routh(3,:)))
+       disp(k)
+end
+
+if(k(2,1)==k(3,1))
+    printf("repeated roots on imaginary axis. hence unstable system")
+\ No newline at end of file