Added check for the correct number of variables and added a few comments

Newton.m

@@ -1,12 +1,20 @@
-function [xList,errorList] = Newton (f, startingValue, errorAllow)
+function [xList,errorList] = Newton(f, startingValue, errorAllow)
 %
+%Newton(f, startingValue, errorAllow)
 %This function uses Newtons method to find a solution to the root of f
 %
 
+	%Check that the number of arguments is correct
+	if(nargin ~= 3)
+		error('That is the wrong number of arguments')
+	end
+	%Things that are necessary to begin
 	pkg load symbolic;
 	warning('off','OctSymPy:sym:rationalapprox');
+	%Constant variables
 	maxIt = 50;
 	fp = diff(f);
+	%Variables
 	oldAnswer = startingValue;
 	newAnswer = 0;
 	cnt = 1;