"Error using matlab.gra​phics.char​t.primitiv​e. Line/set."

I'm trying to write the langston's ant program. However, I keep getting the "Error using matlab.graphics.chart.primitive.Line/set.Invalid or deleted object."

My square cursor steps as it should, but I'm not getting the line marker to show the ant's progress. Here's the part of my code that I'm having trouble with. Any help would be appreciated.

Thanks

 clear all
    close all

    % initialize grid to all zeros (i.e., white)
    gridcolor = zeros(100,100);

    % specify the bounds of the grid
    x_min = 1;  x_max = 100;
    y_min = 1;  y_max = 100;

    % initialize ant position to the middle of the grid
    ant_x = 50;
    ant_y = 50;

    % initialize the ant direction to east
    antdirection = 0;

    % create initial plot with handle 'p', specifying the x and y values as
    % ant_x and ant_y
    p=plot(ant_x,ant_y,'square');%, 'EraseMode','none');

    % Set plot axis to span the grid
    axis([0 100 0 100])

    inside = 1;

    % The number of steps needed to reach the edge of the grid
    total_steps = 0;

    while inside == 1,
        total_steps = total_steps + 1;

        if gridcolor(ant_x,ant_y) == 0,  % if the square is white, then
            antdirection = antdirection + 90;  % turn 90 deg to the right
        else   % otherwise the square is black, so
            antdirection = antdirection - 90;  % turn 90 deg to the left
        end

        % check antdirection and modify if necessary to keep it in the range of
        % 0 to 360 degrees
        if antdirection >= 360,
            antdirection = antdirection - 360;
        elseif antdirection < 0,
            antdirection = antdirection + 360;
        end

        % the ant always flips the color of the square that it is on
        gridcolor(ant_x,ant_y) = ~gridcolor(ant_x,ant_y);

        if gridcolor(ant_x,ant_y) == 0,   % if the grid square is white, then
            % set the Marker edge and face color to white for the x,y point 

            set(p,'MarkerEdgeColor','w','MarkerFaceColor','w','XData',ant_x,'YData',ant_y)

        else  % the grid square is black, so
            %set the Marker edge and face color to black for the x,y point 

           set(p,'MarkerEdgeColor','black','MarkerFaceColor','black','XData',ant_x,'YData',ant_y)

        end        

       drawnow

        % determine the x and y direction of the ant motion 
        ant_motion_x = cosd(antdirection);
        ant_motion_y = sind(antdirection);

        % move the ant to the next square
        ant_x = ant_x + ant_motion_x;
        ant_y = ant_y + ant_motion_y;

        % determine if the ant has move outside the grid; if so, set inside to
        % 0 so that the loop terminates
        if (ant_x<x_min) || (ant_x>x_max),
            inside = 0;
        elseif (ant_y<y_min) || (ant_y>y_max),
            inside = 0;
        end

    end

[Walter Roberson]

I copied and pasted your code exactly and had no difficulty with the error you mention. It took a while for it to get out of the center zone but moved quickly once it did.

[S Foggie]

Hello Walter, Thanks for the response. I'm using ver. 2015a and gets the "Warning: The EraseMode property is no longer supported and will error in a future release. Use the ANIMATEDLINE function for animating lines and points instead of EraseMode 'none'."

My cursor moves but the squares do not turn black as they should. I'll try to debug again. Thanks

[Walter Roberson]

Your posted code has the EraseMode bit commented out, so it would not give a warning ;-)

[S Foggie]

Yes, sorry. I was debugging and inadvertently copied my version with the line commented out to let it run without errors. The warning says ErasedMode is no longer supported after ver.2014a and should be replaced with Animatedline but I haven't figured out how to make it work.

Answer 1

[Walter Roberson]

Adjusted code. This does away with drawmode entirely and works on images.

You might want to add

set(ax, 'YDir', 'reverse')

[S Foggie]

Thanks Walter! There's no way I would have figured this out. I'm going to study how to use the imaging and color properties instead of the drawmode.

[Walter Roberson]

Updating the CData of an image object is something that comes with experience; it is efficiency (and saves having to re-do axis() calls.)

The biggest "trick" here is that normally 0 corresponds to black and 1 corresponds to white, but I used a color map in which the first entry is white and the second entry is black so that 0 maps to white and 1 maps to black.

[Jonathan]

@Mr Roberson

I would to ask something in line with this. I am using a Kin2 Toolbox for Matlab to map depth frames from color with Kinect V2 sensor. I am getting this error:

"Error using matlab.graphics.primitive.Image/set Invalid or deleted object"

Can you help me on figuring out what might be the problem. The code is as follows

clear; clc;
addpath('Mex');

k2 = Kin2('color','depth');
X_mm_to_pixel = 1190/1920; Y_mm_to_pixel = 670/1080;
redThresh = 0.25;

% images sizes
d_width = 512; d_height = 424; outOfRange = 4000;
c_width = 1920; c_height = 1080;

COL_SCALE = 0.5;

% Create matrices for the images
depth = zeros(d_height,d_width,'uint16');
color = zeros(c_height*COL_SCALE,c_width*COL_SCALE,3,'uint8');

% Images used to draw the markers
depthAdditions = zeros(d_height,d_width,3,'uint8');
colorAdditions = zeros(c_height*COL_SCALE,c_width*COL_SCALE,3,'uint8');

% depth stream figure
d.h = figure;
d.ax = axes('units','pixels');
d.im = imshow(depth,[0 255]);
title('Depth Source')

% color stream figure
c.h = figure;
c.im = imshow(color,[]);
title('Color Source');

nFrame=0;
while true
    % Get frames from Kinect and save them on underlying buffer
    validData = k2.updateData;
    
    % Before processing the data, we need to make sure that a valid
    % frame was acquired.
    if validData
        % Copy data to Matlab matrices
        depth = k2.getDepth;
        color = k2.getColor;
        
        % update depth figure
        depth8u = uint8(depth*(255/outOfRange));
        depth8uc3 = repmat(depth8u,[1 1 3]);
        set(d.im,'CData',depth8uc3 + depthAdditions);
        
        % update color figure
        color = imresize(color,COL_SCALE);
        
        set(c.im,'CData',color + colorAdditions);
    end
    if ~isempty(nFrame)
        if nFrame<=100
            s=color();
            red = s(:,:,1);
            diffFrame = imsubtract(s(:,:,1), rgb2gray(s));
            diffFrame = medfilt2(diffFrame, [3 3]);
            binFrame = imbinarize(diffFrame, redThresh);
            binFrame = bwareaopen(binFrame,300);
            bw = bwlabel(binFrame, 8);
            
            stats = regionprops((bw), 'BoundingBox', 'Centroid');
            centroids = cat(1, stats.Centroid);
            imshow(s);
            hold on
            %This is a loop to bound the red objects in a rectangular box.
            for object = 1:length(stats)
                bb = stats(object).BoundingBox;
                bc = stats(object).Centroid;
                rectangle('Position',bb,'EdgeColor','r','LineWidth',2)
                plot(bc(1),bc(2), '-m+')
                a=text(bc(1)+15,bc(2), strcat('X: ', num2str(round(bc(1))), '    Y: ', num2str(round(bc(2)))));
                set(a, 'FontName', 'Arial', 'FontWeight', 'bold', 'FontSize', 12, 'Color', 'yellow');
                X = bc(1); Y = bc(2);
                X_pos = 1920-X; Y_pos = Y;
                X_Rob = X_pos*X_mm_to_pixel;
                Y_Rob = Y*Y_mm_to_pixel; 
                y = X_Rob; x = Y_Rob;
                ObjPos = [x y];
                
                disp('Input Color Coordinates')
                disp([X Y]);
              
                depthCoords = k2.mapColorPoints2Depth([X/COL_SCALE Y/COL_SCALE]);
                
                
                disp('Output depth coordinates')
                disp(depthCoords);
                depthAdditions = insertMarker(depthAdditions,depthCoords,'Color','green');
                
                a=depthCoords(1,2);b=depthCoords(1,1);
                Z=depth(a,b);
                disp(Z)
            
            end
            hold off
            x=Y_Rob;
            y=X_Rob;
            z=Z
            x=int2str(x);
            y=int2str(y);
            z=int2str(z);
            s=strcat('[',x,',',y,',',z,']')
           
            pause(3)
            
        end
        nFrame = nFrame+1;
    end
end

[Walter Roberson]

The typical cause of that error in the kind of code structure you are using, is that the problem occurs upon closing the figure without having stopped the update loop. That leaves the loop trying to update a deleted object.

After the pause() call, check isvalid() on the figure and exit the loop if not.

Answer 2

[Ataklti Kahsay]

please help me i have faced thesame problem

Obj =

1.0e+13 *

2.3579 + 0.0097i 0.0106 + 0.0000i

Obj =

1.0e+11 *

4.0416 + 2.4312i 0.0186 + 0.0110i

Obj =

1.0e+12 *

1.8716 + 0.2003i 0.0085 + 0.0009i

Obj =

1.0e+11 *

8.6100 + 3.2635i 0.0392 + 0.0147i

Obj =

1.0e+11 *

3.5387 + 3.1425i 0.0164 + 0.0142i

Warning: One or more feasible individuals has a complex fitness function value. gamultiobj is using the real part of the

fitness function values

> In rankAndDistance (line 21)

In gamultiobjMakeState (line 199)

In gamultiobjsolve (line 20)

In gamultiobj (line 304)

In Main_Genetic_Algorithm (line 41)

Warning: Imaginary parts of complex X and/or Y arguments ignored.

> In gaplotpareto>plotFirstFront (line 72)

In gaplotpareto (line 28)

In gadsplot>callOnePlotFcn (line 194)

In gadsplot (line 141)

In gamultiobjsolve (line 24)

In gamultiobj (line 304)

In Main_Genetic_Algorithm (line 41)

Warning: Using only the real component of complex data.

> In matlab.graphics.chart.internal.getRealData (line 52)

In bar (line 139)

In gaplotscores (line 41)

In gadsplot>callOnePlotFcn (line 194)

In gadsplot (line 141)

In gamultiobjsolve (line 24)

In gamultiobj (line 304)

In Main_Genetic_Algorithm (line 41)

Obj =

1.0e+12 *

1.1881 + 0.2512i 0.0054 + 0.0011i

Obj =

1.0e+11 *

3.1144 + 3.0470i 0.0145 + 0.0137i

Obj =

1.0e+11 *

3.7438 + 2.8514i 0.0173 + 0.0128i

Obj =

1.0e+11 *

3.0983 + 3.0006i 0.0144 + 0.0135i

Obj =

1.0e+11 *

4.5208 + 1.6571i 0.0207 + 0.0075i

Obj =

1.0e+11 *

3.0157 + 2.9600i 0.0140 + 0.0133i

Error using matlab.graphics.chart.primitive.Line/set

Complex values are not supported.

Error in gaplotpareto>plotFirstFront (line 84)

set(plotHandle,'Xdata',xy(:,1), 'Ydata',xy(:,2));

Error in gaplotpareto (line 28)

plotFirstFront(state.Score(range,:),state.Rank(range),markers{1 + mod(i,5)},objectivesToPlot(:)',flag,tag);

Error in gadsplot>callOnePlotFcn (line 194)

optimvalues = plotfcn(varargin{1:end});

Error in gadsplot (line 148)

[state,optimvalues] =

callOnePlotFcn(fname,plotNames{i},state,options.OutputPlotFcnOptions,optimvalues,flag,args{i}{:});

Error in gamultiobjsolve (line 64)

state = gadsplot(options,state,currentState,'Genetic Algorithm');

Error in gamultiobj (line 304)

[x,fval,exitFlag,output,population,scores] = gamultiobjsolve(FitnessFcn,nvars, ...

Error in Main_Genetic_Algorithm (line 41)

[X, fval, exitflag, output, population, scores] = gamultiobj(@Fitness_Function, ...

[Walter Roberson]

You asked this over at https://www.mathworks.com/matlabcentral/answers/268040-how-to-eliminate-or-exclude-complix-numbers-from-an-array-solution#comment_1589880 and I responded there.

(You should have created your own Question, really.)