Inputting enough arguments, but getting a not enough input arguments error for "length"

Hello,

I'm having problems with the class constructor for my CoaxLine class. I pass it all the arguments it needs, but when I create an object in another program, I get the error:

Error using length Not enough input arguments.

Error in CoaxLine (line 23) function obj = CoaxLine(pow,len,h,freq,x1,x2,y1,y2,dir,split)

Error in Test2 (line 38) coax1 = CoaxLine(3.9,100,4.75,1800,10,110,10,10,0,1);

I got this same error with length even when I removed all the argument requirements for the constructor, and created the object with no inputs. This is my first time building a class in MATLAB, so it is likely that I missed something silly. I appreciate the help.

Here is the code for CoaxLine:

    classdef CoaxLine
    %UNTITLED2 Summary of this class goes here
    %   Detailed explanation goes here

    properties 
        PA;
        orientation; %0 for East-West, 1 for North-South
        splitter; %0 for left side, 1 for right side
        length;
        frequency; %in MHz
        height;
        Ce = 8.77; %Hardcoded for now
        Lint = .13; %Hardcoded
        nearFieldLength = 2*(length^2)/((3.0*10^8)/(frequency*10^6));
        X1; %Will be points in the simulation axis
        X2;
        Y1;
        Y2;
        %loss;
    end

    methods 
       function obj = CoaxLine(pow,len,h,freq,x1,x2,y1,y2,dir,split)
            if nargin > 0
                obj.PA = pow;
                obj.length = len;
                obj.height = h;
                obj.frequency = freq;
                obj.X1 = x1;
                obj.X2 = x2;
                obj.Y1 = y1;
                obj.Y2 = y2;
                obj.orientation = dir;
                obj.splitter = split;
            end    
        end

        function r = contribution(px,py)
            if(obj.orientation == 0)
               if(obj.splitter)
                   if(abs(py - obj.Y1) <= obj.nearFieldLength && px > obj.X1 && px < obj.X2)
                       H = abs(py - obj.Y1);
                       x = px - obj.X1;
                       r = NearFieldPropagation(obj.PA,obj.length,obj.frequency,H,obj.height,obj.Ce,obj.Lint,x);
                   end               
               else
                   if(abs(py - obj.Y1) <= obj.nearFieldLength && px < obj.X1 && px > obj.X2)
                       H = abs(py - obj.Y1);
                       x = obj.X1 - px;
                       r = NearFieldPropagation(obj.PA,obj.length,obj.frequency,H,obj.height,obj.Ce,obj.Lint,x);
                   end
               end             

               %else

            end
        end
    end
end

Answer 1

[Walter Roberson]

You have a conflict between naming the property 'length' and the MATLAB function 'length' in your specification of nearFieldLength. I suggest that you do not initialize nearFieldLength in the Properties section and instead initialize it when the object is constructed, making use of the passed len