1 files changed, 17 insertions, 0 deletions
diff --git a/257/CH8/EX8.18/example_8_18.sce b/257/CH8/EX8.18/example_8_18.sce
new file mode 100644
index 000000000..84b2438de
--- /dev/null
+++ b/257/CH8/EX8.18/example_8_18.sce
@@ -0,0 +1,17 @@
+s=%s
+// C=s^4+10*s^3+36*s^2+70*s+75    characteristic equation//
+F=(s-2)^4+10*(s-2)^3+36*(s-2)^2+70*(s-2)+75    //shifting the origin with respect to s=-2//
+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("there are %d roots to the right of s=-2 line",c+1)
+  else printf("system is stable")
+  end