added vector dot product

mathgenerator/funcs/__init__.py

@@ -71,3 +71,4 @@ from .multiplyComplexNumbersFunc import *
 from .geomProgrFunc import *
 from .geometricMeanFunc import *
 from .harmonicMeanFunc import *
+from .vectorDotFunc import *

mathgenerator/funcs/vectorDotFunc.py

@@ -0,0 +1,13 @@
+from .__init__ import *
+
+
+def vectorDotFunc(minVal=-20, maxVal=20):
+     a = [random.randint(minVal, maxVal) for i in range(3)]
+     b = [random.randint(minVal, maxVal) for i in range(3)]
+     c = [a[0] * b[0],
+         a[1] * b[1] ,
+         a[2] * b[2] ]
+
+     problem = str(a) + " . " + str(b) + " = "
+     solution = str(c)
+     return problem, solution