Week 2- 2R Robotic Arm Challenge

Errors faced:

in line 25 command

M(ct)=getframe(gcf); it shows the error as "the varaible M appears to change size often so provide cell size."

action taken:

without any modifications the results came but dont understand what the error is

attached the screenshot of the error

youtube video link: https://youtu.be/6Nk0smEG-kk

% forward kinematics with movie command and frame command
%inputs
close all  % closes all the previous plots
clear all  % clears all the previous results
clc         % clears all previous in command window
l1=1.5;     % values for arm l1 and l2 are given
l2=1;
theta1=linspace(0,90,10); % for theta1 and theta2 10 values are taken from 0 to 90
theta2=linspace(0,90,10);
ct=1;                     % counter ct is given value as 1
for i=1:length(theta1) % for loop is initiated for 1 to 10 (length theta1) 
    THETA1=theta1(i);  % THETA1 is assigned with value of theta1
    for j=1:length(theta2) % another for loop is initiated for 1 to 10(length theta1)
        THETA2=theta2(j); %THETA2 is assigned with value of theta2
        x0=0;   %inputs for x0,y0 are given.
        y0=0;
        x1=l1*cosd(THETA1); %x1,y1 are assigned with their respective cos and sin value
        y1=l1*sind(THETA1);
        x2=x1+l2*cosd(THETA2); %x2,y2 are assigned with updated x1,y1 and theta values
        y2=y1+l2*sind(THETA2);
        %plotting
        plot([x0 x1],[y0 y1],[x1 x2],[y1 y2],'LineWidth',3)% the plot is being done 
        axis([-1 2.5,0 2.5]) % the axis is being fixed
        pause(0.03) %this command not needed while writing movie frame program
        M(ct)=getframe(gcf); %each figures frame is being saved in M
        ct=ct+1;   % the counter is being initiated
    end 
end
movie(M) %matlab generates movie with all the m
videofile=VideoWriter('forward_kinematics_videos','Uncompressed AVI'); %videofile is 
open(videofile) % the video file is opened
writeVideo(videofile,M) %the video file is written
close(videofile) %the video file is closed



%output explanation
%thevideo file is being played with all captured frames
% if the theta 1 and theta2 values are extended from 10 to 40 or more the video will be clear and can see the workspace clearly,