From 698faa9ca4bdb598aee3d2029b3c21d81fe0cc64 Mon Sep 17 00:00:00 2001
From: lane <ltdouthit@email.arizona.edu>
Date: Thu, 22 Feb 2018 08:40:00 -0700
Subject: [PATCH] Added Simpson Rule to Maths

---
 Maths/SimpsonRule.py | 47 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 Maths/SimpsonRule.py

diff --git a/Maths/SimpsonRule.py b/Maths/SimpsonRule.py
new file mode 100644
index 000000000..51b5ed1e4
--- /dev/null
+++ b/Maths/SimpsonRule.py
@@ -0,0 +1,47 @@
+
+'''
+Numerical integration or quadrature for a smooth function f with known values at x_i
+
+This method is the classical approch of suming 'Equally Spaced Abscissas' 
+
+method 2: 
+"Simpson Rule"
+
+'''
+
+def method_2(boundary, steps):
+# "Simpson Rule"
+# int(f) = delta_x/2 * (b-a)/3*(f1 + 4f2 + 2f_3 + ... + fn)
+	h = (boundary[1] - boundary[0]) / steps
+	a = boundary[0]
+	b = boundary[1]
+	x_i = makePoints(a,b,h)
+	y = 0.0
+	y += (h/3.0)*f(a)
+	cnt = 2
+	for i in x_i:
+		y += (h/3)*(4-2*(cnt%2))*f(i)	
+		cnt += 1
+	y += (h/3.0)*f(b)
+	return y
+
+def makePoints(a,b,h):
+	x = a + h
+	while x < (b-h):
+		yield x
+		x = x + h
+
+def f(x): #enter your function here
+	y = (x-0)*(x-0)
+	return y
+
+def main():
+	a = 0.0 #Lower bound of integration
+	b = 1.0	#Upper bound of integration
+	steps = 10.0		#define number of steps or resolution
+	boundary = [a, b]	#define boundary of integration
+	y = method_2(boundary, steps)
+	print 'y = {0}'.format(y)
+
+if __name__ == '__main__':
+        main()