--- a/scripts/polynomial/polyvalm.m
+++ b/scripts/polynomial/polyvalm.m
@@ -1,20 +1,21 @@
 function y = polyvalm(c,x)
-#Evaluate a polynomial in the matrix sense.
+
+# Evaluate a polynomial in the matrix sense.
 #
-#In octave, a polynomial is represented by it's coefficients (arranged
-#in descending order). For example a vector c of length n+1 corresponds
-#to the following nth order polynomial
-#
-#  p(x) = c(1) x^n + ... + c(n) x + c(n+1).
+# In octave, a polynomial is represented by it's coefficients (arranged
+# in descending order). For example a vector c of length n+1 corresponds
+# to the following nth order polynomial
 #
-#polyvalm(c,X) will evaluate the polynomial in the matrix sense, i.e. matrix
-#multiplication is used instead of element by element multiplication as is
-#used in polyval.
+#   p(x) = c(1) x^n + ... + c(n) x + c(n+1).
 #
-#X must be a square matrix.
+# polyvalm(c,X) will evaluate the polynomial in the matrix sense, i.e. matrix
+# multiplication is used instead of element by element multiplication as is
+# used in polyval.
 #
-#SEE ALSO: polyval, poly, roots, conv, deconv, residue, filter,
-#          polyderiv, polyinteg
+# X must be a square matrix.
+#
+# SEE ALSO: polyval, poly, roots, conv, deconv, residue, filter,
+#           polyderiv, polyinteg
 
 # Author:
 #  Tony Richardson
@@ -22,7 +23,7 @@
 #  June 1994
 
   if(nargin != 2)
-    error("usage: polyvalm(c,x)");
+    usage ("polyvalm(c,x)");
   endif
 
   if(is_matrix(c))