Merge branch 'master' of github.com:vu3rdd/sicp

[sicp.git] / src / sicp / utils.clj

diff --git a/src/sicp/utils.clj b/src/sicp/utils.clj
index 0ee935586625aaf8ad82072126f76d09b7156cfa..516b0141eba9306c16ded1167c800cb8d5407110 100644 (file)
--- a/src/sicp/utils.clj
+++ b/src/sicp/utils.clj
@@ -35,6 +35,16 @@
     a
     (gcd b (rem a b))))
 
+(defn average [ & coll]
+  (/ (reduce + coll)
+     (float (count coll))))
+
+(defn approx-equal [x y]
+  (< (abs (- x y)) 0.00001))
+
+(defn error [^String string]
+  (throw (Exception. string)))
+
 (defmacro microbench
   " Evaluates the expression n number of times, returning the average
     time spent in computation, removing highest and lowest values.