language and code fixes

programming/code/facultyLoop.m

@@ -1,6 +1,6 @@
 n = 5;
 x = 1;
 for i = 1:n
-	  x = x * i;
+    x = x * i;
 end 
-fprintf('Faculty of %i is: %i\n', n, x)
+fprintf('Faculty of %i is: %i\n', n, x)

programming/code/plotMultipleSinewaves.m

@@ -7,7 +7,7 @@ figure()
 hold on
  
 for i = 1:length(amplitudes)
-   for j = i:length(frequencies)
+   for j = 1:length(frequencies)
       [x_data, y_data] = calculate_sinewave(frequencies(j), ...
                                             amplitudes(i), t_max, t_step);
       plot_sinewave(x_data, y_data, sprintf('freq: %5.2f, ampl: %5.2f',...