You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: ConvergencePlotComputerMaterialDesignExperimentCircle.m
    path of file: ./repos/Swan/Topology Optimization/Applications/MaterialDesign
    
    the code of the file until where you have to start completion: classdef ConvergencePlotComputerMaterialDesignExperimentCircle < handle
    
    properties (Access = public)
        
    end
    
    properties (Access =
    
function plotData(obj)
            obj.plotCost();
            obj.plotPerimeter();
            obj.plotVolum();
            obj.plotEpsilon();
        end
        
        function plotCost(obj)
            for iCase = 1:numel(obj.testNames)
                fieldData = obj.fieldsData{iCase};
                fieldToPlot = 'C - C not scaled';
                [x,y] = obj.obtainField(fieldToPlot,fieldData);
                p{iCase} = semilogy(x,y);
                hold on
            end