How to generate a polar plot in a for loop

Hello all,

I want to update a polar graph with every iteration in a for loop. I have tried different ways to solve it but it didn't workout. The funciton "Auto_test" works perfectly, but the only issue is I am not having any error in command window but the graph is not updating or not showing any lines in it.

function T = Auto_test(range, R, seconds) % R = resolution
            times = range / R;

            C = [times 4];
            J = {'string','double','double','double'};
            P = ["No.","Step_Size","Power","Freq"];
            T =  table('Size',C,'VariableTypes',J,'VariableNames',P);
            
            figure

            for step_times = 1:(times + 1) 

                Step_Size = (step_times - 1) * R;

                MyArcus.PositionTo(Step_Size); % calling a motor rotation function 
                pause (seconds)

                Power = str2double(app.obj.Get_Marker_Power(1)); % calling another funciton to get power
                Freq  = str2double(app.obj.Get_Marker_Freq(1));  % calling another funciton to get frequency 
                pause (1)
                
                R_Step = deg2rad(Step_Size); % current motor angle converted to radian 
                
                polarplot(R_Step,Power);     %  polar plot 
                
                L = gca;                     % polar porperties
                angles = 0:20:360;
                L.ThetaTick = angles;
                L.ThetaDir = 'clockwise';
                L.RTickMode = 'auto';
                L.ThetaZeroLocation = 'top';
                hold on

%                 drawnow update            % should I use ' hold on ' here?

                
                T(step_times,:) = {step_times,Step_Size, Power, Freq}; % updating Table data
                pause(0.5)
                
            end 
end

I will be thankful to your help.

Answer 1

[Adam Danz]

It looks like you are plotting single points. The default marker is 'none' such that the function produces lines without markers. But since you're providing only 1 point at a time, there is no line to plot.

Specify a marker if you want to plot a series of points.

% Replace this
polarplot(R_Step,Power)

% with this
polarplot(R_Step,Power, 'o')

[Chirag]

ohh =)) Thanks a lot @Adam Danz.