From: Alexis Laferrière <alexis.laf@xymus.net>
Date: Mon, 9 Mar 2015 20:53:41 +0000 (-0400)
Subject: lib: intro `Float::log_base`
X-Git-Tag: v0.7.3~32^2~2
X-Git-Url: http://nitlanguage.org

lib: intro `Float::log_base`

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
---

diff --git a/lib/standard/math.nit b/lib/standard/math.nit
index eec0cf6..2b55dca 100644
--- a/lib/standard/math.nit
+++ b/lib/standard/math.nit
@@ -167,12 +167,18 @@ redef class Float
 	#     #assert 0.0.pow(9.0) == 0.0
 	fun pow(e: Float): Float is extern "kernel_Float_Float_pow_1"
 
-	# Returns the logarithm of `self`.
+	# Natural logarithm of `self`.
 	#
 	#     assert 0.0.log.is_inf == -1
 	#     #assert 1.0.log == 0.0
 	fun log: Float is extern "kernel_Float_Float_log_0"
 
+	# Logarithm of `self` to base `base`.
+	#
+	#     assert 100.0.log_base(10.0) == 2.0
+	#     assert 256.0.log_base(2.0) == 8.0
+	fun log_base(base: Float): Float do return log/base.log
+
 	# Returns *e* raised to `self`.
 	fun exp: Float is extern "kernel_Float_Float_exp_0"