fixed Channel write function

OOequipment/Channel.m

@@ -118,15 +118,15 @@ classdef Channel
     end
     
     methods (Hidden, Access = private)
-        function c = CHAN(ch,string)
+        function c = CHAN(ch,string,in)
             if nargin == 2
                 if strcmp(string(end),'?')
                     c = ch.scope.query(['CHAN',num2str(ch.channelnumber),':',string]);
                 else
-                    c = ch.scope.write(['CHAN',num2str(ch.channelnumber),':',string]);
+                    ch.scope.write(['CHAN',num2str(ch.channelnumber),':',string]);
                 end
             else
-                c = ch.scope.write(['CHAN',num2str(ch.channelnumber),':',string,' ',in]);
+                ch.scope.write(['CHAN',num2str(ch.channelnumber),':',string,' ',in]);
             end
         end