r11439 - /1.3/maths_fns/pseudo_ellipse.py -- August 09, 2010 - 10:39

Author: bugman
Date: Mon Aug  9 10:39:16 2010
New Revision: 11439

URL: http://svn.gna.org/viewcvs/relax?rev=11439&view=rev
Log:
Implemented the sinc() function.


Modified:
    1.3/maths_fns/pseudo_ellipse.py

Modified: 1.3/maths_fns/pseudo_ellipse.py
URL: 
http://svn.gna.org/viewcvs/relax/1.3/maths_fns/pseudo_ellipse.py?rev=11439&r1=11438&r2=11439&view=diff
==============================================================================
--- 1.3/maths_fns/pseudo_ellipse.py (original)
+++ 1.3/maths_fns/pseudo_ellipse.py Mon Aug  9 10:39:16 2010
@@ -24,7 +24,7 @@
 """Module for the pseudo-elliptical functions."""
 
 # Python module import.
-from math import pi
+from math import pi, sin
 
 
 def factorial(n):
@@ -204,3 +204,28 @@
 
     # Return the approximate function value.
     return fn
+
+
+def sinc(x):
+    """Implementation of the sinc() function.
+
+    The formula is::
+
+                   /  1,            for x = 0,
+        sinc(x) = <
+                   \  sin(x)/x,     otherwise.
+
+
+    @param x:   The angle x in rad.
+    @type x:    float
+    @return:    The value of sinc(x).
+    @rtype:     float
+    """
+
+    # Limit condition.
+    if x == 0:
+        return 1.0
+
+    # All other values.
+    else:
+        return sin(x) / x