--- /dev/null
+function c_norm = c_norm(w, a, b, v)
+ ##
+ ## The norm on C[a,b] induced by c_inner_product.
+ ##
+ ## INPUT:
+ ##
+ ## * ``w`` -- The weight function.
+ ##
+ ## * ``a`` -- The left endpoint of the interval.
+ ##
+ ## * ``b`` -- The right endpoint of the interval.
+ ##
+ ## * ``v`` -- The vector.
+ ##
+ ## OUTPUT:
+ ##
+ ## The norm of `v`; that is, the inner product sqrt(<v, v>).
+ ##
+ c_norm = sqrt(c_inner_product(w, a, b, v, v));
+end