+ if (x < 0)
+ return 1.0;
+ return max (- epsilon * (x - threshold) / ((x + epsilon) * threshold), 0.0);
+}
+
+/*
+ 0 at 0, 1 at standard_x, and increasing thereafter.
+ */
+Real
+convex_amplifier (Real standard_x, Real increase_factor, Real x)
+{
+ return (exp (increase_factor * x / standard_x) - 1.0) / (exp (increase_factor) - 1.0);
+}
+
+string
+camel_case_to_lisp_identifier (string in)
+{
+ vector<char> out;
+
+ /* don't add '-' before first character */
+ out.push_back (tolower (in[0]));
+
+ for (size_t inpos = 1; inpos < in.size (); inpos++)