diff --git a/samples/plot,functions,polyval.m b/samples/plot,functions,polyval.m
new file mode 100644
index 0000000..bbb331d
--- /dev/null
+++ b/samples/plot,functions,polyval.m
@@ -0,0 +1,10 @@
+fplot( @(x) x^2 * cos(x), [-4 4],'r*' )
+hold on
+
+p= [1,2,3,4,5]
+x=1:0.1:10
+y=polyval(p,x)
+plot(x,y)
+
+
+polyfit(x,y,n) // n è il grado
\ No newline at end of file