updating tiledlayout in a loop - "Invalid or deleted object"

Hello, I am trying to write a program that creates a GIF of a 3D trajectory (t, x, y, z coordinate data in file xxxy.mat) from 4 different perspectives. However, I keep getting the classic "Invalid or deleted object" error when I first try to alter the tile axes in the plotting loop. The code is pasted below and any help is appreciated.

clear;clc;
load('xxxy.mat')
%%
% Create file name variable
filename = 'animation_spiral_3POV.gif';

% Setting up the Plot
l = tiledlayout(2,2);
title(l,sprintf('Trajectory\nTime: %0.2f sec', t(1)),...
    'Interpreter','Latex');
%%
% Plotting the first iterations
nexttile(1)
p1 = plot(-xx(1),-xy(1),'b');
m1 = scatter(-xx(1),-xy(1),'filled','b');
grid on  % Adding grid lines
axis equal  % Equal axis aspect ratio
xlim([-5 5])
ylim([-5 5])
hold on
title('Top View', 'Interpreter', 'Latex')

nexttile(2)
p2 = plot(-xy(1),xz(1),'b');
m2 = scatter(-xy(1),xz(1),'filled','b');
grid on  % Adding grid lines
axis equal  % Equal axis aspect ratio
xlim([-5 5])
ylim([-5 5])
hold on
title('Side View', 'Interpreter', 'Latex')

nexttile(3)
p3 = plot(-xx(1),xz(1),'b');
m3 = scatter(-xx(1),xz(1),'filled','b');
grid on  % Adding grid lines
axis equal  % Equal axis aspect ratio
xlim([-5 5])
ylim([-5 5])
hold on
title('Front View', 'Interpreter', 'Latex')

nexttile(4)
p = plot3(xx(1),xy(1),xz(1),'b');
m = scatter3(xx(1),xy(1),xz(1),'filled','b');
grid on  % Adding grid lines
axis equal  % Equal axis aspect ratio
xlim([-5 5])
ylim([-5 5])
zlim([-5 5])
view(-170,15);  % Setting viewing angle
hold on
title('3D View', 'Interpreter', 'Latex')
%%
% Iterating through the length of the time array
for k = 1:200:length(t)
    % Updating the line (p) and scatter points (m)
    nexttile(l,1)
    p1.XData = -xx(1:k);
    p1.YData = -xy(1:k);
    m1.XData = -xx(k);
    m1.YData = -xy(k);
    nexttile(l,2)
    p2.XData = -xy(1:k);
    p2.YData = xz(1:k);
    m2.XData = -xy(k);
    m2.YData = xz(k);
    nexttile(l,3)
    p3.XData = -xx(1:k);
    p3.YData = xz(1:k);
    m3.XData = -xx(k);
    m3.YData = xz(k);
    nexttile(l,4)
    p.XData = xx(1:k);
    p.YData = xy(1:k);
    p.ZData = xz(1:k);
    m.XData = xx(k); 
    m.YData = xy(k);
    m.ZData = xz(k);
    % Updating the title
    title(l,sprintf('Trajectory\nTime: %0.2f sec', t(k)),...
    'Interpreter','Latex');
    % Delay
    pause(0.1)
    % Saving the figure
    frame = getframe(gcf);
    im = frame2im(frame);
    [imind,cm] = rgb2ind(im,256);
    if k == 1
        imwrite(imind,cm,filename,'gif', 'Loopcount',inf,...
        'DelayTime',0.1);
    else
        imwrite(imind,cm,filename,'gif','WriteMode','append',...
        'DelayTime',0.1);
    end
end

Error using load
Unable to find file or directory 'xxxy.mat'.

Answer 1

[VBBV]

Delete the hold on commands that are present AFTER the scatter commands and place it BEFORE the scatter commands. Then add the function handles to every nexttile commands inside the for loop and call those function handles in the hold on commands inside the loop as shown below There is also a title command inside loop at the end, which may not be correct way and relates only to the last of subplots i.e. 4 in the figure

clear;clc;
load('xxxy.mat')
%%
% Create file name variable
filename = 'animation_spiral_3POV.gif';

% Setting up the Plot
L = tiledlayout(2,2);
title(L,sprintf('Trajectory\nTime: %0.2f sec', t(1)),...
    'Interpreter','Latex');
%%
% Plotting the first iterations
nexttile(1)
p1 = plot(-xx(1),-xy(1),'b');
hold on
m1 = scatter(-xx(1),-xy(1),'filled','b');
grid on  % Adding grid lines
axis equal  % Equal axis aspect ratio
xlim([-5 5])
ylim([-5 5])
% delete this hold on
title('Top View', 'Interpreter', 'Latex')

nexttile(2)
p2 = plot(-xy(1),xz(1),'b');
hold on
m2 = scatter(-xy(1),xz(1),'filled','b');
grid on  % Adding grid lines
axis equal  % Equal axis aspect ratio
xlim([-5 5])
ylim([-5 5])
% delete this hold on
title('Side View', 'Interpreter', 'Latex')

nexttile(3)
p3 = plot(-xx(1),xz(1),'b');
hold on
m3 = scatter(-xx(1),xz(1),'filled','b');
grid on  % Adding grid lines
axis equal  % Equal axis aspect ratio
xlim([-5 5])
ylim([-5 5])
% delete this hold on
title('Front View', 'Interpreter', 'Latex')

nexttile(4)
p = plot3(xx(1),xy(1),xz(1),'b');
hold on
m = scatter3(xx(1),xy(1),xz(1),'filled','b');
grid on  % Adding grid lines
axis equal  % Equal axis aspect ratio
xlim([-5 5])
ylim([-5 5])
zlim([-5 5])
view(-170,15);  % Setting viewing angle
% delete this hold on
title('3D View', 'Interpreter', 'Latex')
%%
% Iterating through the length of the time array
for k = 1:200:length(t)
    % Updating the line (p) and scatter points (m)
    
    ax1 = nexttile(L,1) % add a function handle
    hold(ax1,'on') % call the function handle in hold on
    p1.XData = -xx(1:k);
    p1.YData = -xy(1:k);
    m1.XData = -xx(k);
    m1.YData = -xy(k);
    
    ax2 = nexttile(L,2) % add a function handle
    hold(ax2,'on')  % call the function handle in hold on
    p2.XData = -xy(1:k);
    p2.YData = xz(1:k);
    m2.XData = -xy(k);
    m2.YData = xz(k);
    
    ax3 = nexttile(L,3)  % add a function handle
    hold(ax3,'on')  % call the function handle in hold on
    p3.XData = -xx(1:k);
    p3.YData = xz(1:k);
    m3.XData = -xx(k);
    m3.YData = xz(k);
    
    ax4 = nexttile(L,4)  % add a function handle
    hold(ax4,'on')   % call the function handle in hold on
    p.XData = xx(1:k);
    p.YData = xy(1:k);
    p.ZData = xz(1:k);
    m.XData = xx(k); 
    m.YData = xy(k);
    m.ZData = xz(k);
    % Updating the title
    % title(L,sprintf('Trajectory\nTime: %0.2f sec', t(k)),...
    % 'Interpreter','Latex');
    % Delay
    pause(0.1)
    % Saving the figure
    frame = getframe(gcf);
    im = frame2im(frame);
    [imind,cm] = rgb2ind(im,256);
    if k == 1
        imwrite(imind,cm,filename,'gif', 'Loopcount',inf,...
        'DelayTime',0.1);
    else
        imwrite(imind,cm,filename,'gif','WriteMode','append',...
        'DelayTime',0.1);
    end
end

[Ian Heyman]

This absolutely worked, thanks so much for taking the time to go through the code! And the update to the title command specifies the title is for L, the tiledlayout, so that the title updates with the time of the trajectory motion. Thanks, again.

Answer 2

[the cyclist]

Put a

hold on

call after each of your nexttile commands, to prevent the second plot of each tile from replacing the first one (and thereby "deleting" it).

[Ian Heyman]

This absolutely worked, much thanks!