Merge branch 'master' of https://github.com/jrtechs/RandomScripts

other/minMul.py

@@ -0,0 +1,55 @@
+import math
+
+"""
+Jeffery Russell
+11-12-18
+"""
+
+
+def minMul(S):
+    """
+    Simple function to print the matrixes used in
+    the minimum matrix chain multiplication problem
+    using dynamic programming.
+    """
+    n = len(S)
+    m = [[math.inf for i in range(n)] for j in range(n)]
+    c = [[0 for i in range(n)] for j in range(n)]
+
+    for i in range(0, n):
+        m[i][i] = 0
+    
+    for l in range(1, n + 1):
+        for i in range(0, n-l + 1):
+            j = l + i -1
+            for k in range(i, j):
+                temp = m[i][k] + m[k + 1][j] + S[i][0] * S[k][1] * S[j][1]
+                print(temp)
+                if temp < m[i][j]:
+                    m[i][j] = temp
+                    c[i][j] = k + 1
+
+
+    for i in range(0, n):
+        for y in range(0, n):
+            print(str(m[i][y]) + " ", end =" ")
+        print()
+
+
+    print()
+    print()
+    for i in range(0, n):
+        for y in range(0, n):
+            print(str(c[i][y]) + " ", end =" ")
+        print()    
+
+
+"""
+Makes sure that other programs don't execute the main
+"""
+if __name__ == '__main__':
+    try:
+        minMul([(10,100),(100, 5),(5, 50)])
+        #minMul([(5,10),(10,3),(3,12), (12,5), (5,50), (50,6)])
+    except KeyboardInterrupt:
+        exit()