misc.Gains: minor changes for readability

+misc/Gains.m

@@ -149,13 +149,18 @@ classdef Gains < handle & matlab.mixin.Copyable
 			end % for it = 1 : numel(obj.outputType)
 		end % dps.Output
 		
-		function gainSeries = series(gainHead, gainTail, inputOfHeadObj, outputNextOutput)
-			% series implements the series interconnection of obj and gainNext. The
-			% new outputs are those of obj, but the inputs are those of gainNext. The
-			% outputType outputNextOutput of gainNext will be connected to the input
-			% inputObj.
-			thisHead = gainHead.get(inputOfHeadObj);
-			thisTail = gainTail.gainOfOutput(outputNextOutput);
+		function gainSeries = series(gainHead, gainTail, inputGainHead, outputGainTail)
+			% series implements the series interconnection of obj and gainTail. The new outputs are
+			% those of gainHead, but the inputs are those of gainTail. The outputType outputGainTail
+			% of gainTail will be connected to the input inputGainHead of gainHead.
+			arguments
+				gainHead misc.Gains;
+				gainTail misc.Gains;
+				inputGainHead string;
+				outputGainTail string;
+			end
+			thisHead = gainHead.get(inputGainHead);
+			thisTail = gainTail.gainOfOutput(outputGainTail);
 			gainSeries = misc.Gains();
 			for it = 1 : thisTail.numTypes
 				tempTail = thisTail.gain(it);
@@ -165,7 +170,7 @@ classdef Gains < handle & matlab.mixin.Copyable
 					"lengthOutput", thisHead.lengthOutput));
 			end
 			otherInputsOfHead = copy(gainHead);
-			otherInputsOfHead.remove(inputOfHeadObj);
+			otherInputsOfHead.remove(inputGainHead);
 			gainSeries.add(otherInputsOfHead);
 		end % series()