From d03173ecb236fc915b77e1ada6c4c781105b1e00 Mon Sep 17 00:00:00 2001
From: Keith Calise <KeithCalise@gmail.com>
Date: Mon, 11 May 2015 22:32:02 -0400
Subject: [PATCH] Almost finished

---
 matrix_math.py | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 50 insertions(+)

diff --git a/matrix_math.py b/matrix_math.py
index 7c55a83..03002ea 100644
--- a/matrix_math.py
+++ b/matrix_math.py
@@ -1,2 +1,52 @@
 class ShapeException(Exception):
     pass
+m = [3, 4 ,5]
+n = [5, 0, 1]
+z = [9,8]
+w = [0, 2, 4]
+y = [10, 20, 30]
+
+
+def shape_of(vec1):
+    if type(vec1[0])==int:
+        return (len(vec1),)
+    else:
+        return(len(vec1),len(vec1[1]))
+
+def shape_vectors(x):
+    return (len(x), )
+
+
+def vector_add(vec1, vec2):
+    if shape_of(vec1)!=shape_of(vec2):
+        raise ShapeException()
+    return [(vec1[i]+vec2[i]) for i in range(len(vec1))]
+
+
+
+
+def vector_add_is_communicative(vec1, vec2):
+     if vector_add(vec1,vec2) == vector_add(vec2,vec1):
+         return True
+
+
+def vector_sub(vec1,vec2):
+    if shape_of(vec1)!=shape_of(vec2):
+        raise ShapeException()
+    return [(vec1[i]-vec2[i]) for i in range(len(vec1))]
+
+
+def vector_sum(*vectors):
+    vec_len = len(vectors[1])
+    for i in vectors:
+        if len(i)!=vec_len:
+            raise ShapeException()
+    return [sum(i) for i in zip(*vectors)]
+
+def dot(vec1,vec2):
+    if shape_of(vec1)!=shape_of(vec2):
+        raise ShapeException()
+    return sum([(vec1[i]*vec2[i]) for i in range(len(vec1))])
+
+def vector_multiply(vec1, scalar):
+    return [vec1[i] * scalar for i in range(len(vec1))]