# HG changeset patch
# User Teemu Piippo <crimsondusk64@gmail.com>
# Date 1429846808 -10800
# Node ID 7349e9c6176b7c13ebdf1cde4171a78b2c11efc7
# Parent  c82cef74700861ed5615ca13f0d8d9bf8a71967d
Added sgn(x) to .calc

diff -r c82cef747008 -r 7349e9c6176b calc.py
--- a/calc.py	Sun Apr 19 22:46:39 2015 +0300
+++ b/calc.py	Fri Apr 24 06:40:08 2015 +0300
@@ -134,6 +134,9 @@
 	else:
 		OperatorSymbols[op.symbol] = [op]
 
+def sgn (x):
+	return cmp (x, 0)
+
 Constants = {
 	'pi': cmath.pi,
 	'e': cmath.e,
@@ -177,6 +180,7 @@
 	'im':		{ 'function': lambda x: x.imag },
 	'conjugate':{ 'function': lambda x: x.conjugate() },
 	'rand':		{ 'function': random.random },
+	'sgn':		{ 'function': realf (sgn) },
 }
 
 Tokens = ['(', ')']