Error: Index in position 2 exceeds array bounds (must not exceed 1).

Hello,

i have a problem with my code, specifically with my animation output.

As soon as the code gets to line 500, where the animation part is, i get the error from the title with the following added:

" Index in position 2 exceeds array bounds (must not exceed 1).

Error in sym/subsref (line 890)

R_tilde = builtin('subsref',L_tilde,Idx);

Error in A33Meins (line 501)

animation4(t,x(:,1:13),.05,{fh_boden_fix boden_fix 4;..."

Here is my code :

%% Animation:
boden_fix    = {[-1.25     0     0;
                 1.25     0     0]};
             
boden_u      = {[0.9     0     0;
                 1.2     0     0]};
karosserie_1 = {[-p.a/2  -p.hs   0;
                 p.a/2  -p.hs    0;
                 p.a/2  p.hs  0;
                -p.a/2  p.hs  0;
                -p.a/2  -p.hs  0]};
hebel_2      = {[ 0    0     0; 
                  p.be  0     0]};
hebel_3      = {[ 0    0     0; 
                  -p.be  0     0]};              
              
hebel_5      = {[ 0    0     0; 
                  -p.b5  0     0]};

hebel_7      = {[ 0    0     0; 
                  p.b5  0     0]};
koerper_4      = {[ 0         0     0; 
                   -p.b4/2   p.hs4     0;
                    p.bc     p.hs4     0;
                    p.bc     -p.hc4     0;
                    p.bc     p.h4     0;
                    p.bc     p.hs4     0;
                    -p.b4/2   p.hs4     0;
                    -p.b4     p.h4      0]};  
                
koerper_6      = {[ 0         0     0; 
                    p.b4/2   p.hs4     0;
                    -p.bc    p.hs4     0;
                    -p.bc    -p.hc4     0;
                    -p.bc     p.h4     0;
                    -p.bc     p.hs4     0;
                    p.b4/2   p.hs4     0;
                    p.b4     p.h4      0]}; 
                
                
fh_boden_fix      = @(t,x)deal([0;0;         0],[1,0,0;0,1,0;0,0,1]);
fh_boden_u      = @(t,x)deal([0;u_von_t(t);0],[1,0,0;0,1,0;0,0,1]);

fh_karosserie_1 = matlabFunction(I_r_OS1,A_IK1,         'vars', {t, q});
fh_hebel_2      = matlabFunction(I_r_OA, A_IK2,         'vars', {t, q});
fh_hebel_3      = matlabFunction(I_r_OB, A_IK3,         'vars', {t, q});
fh_hebel_5      = matlabFunction(I_r_OF, A_IK5,         'vars', {t, q});
fh_hebel_7      = matlabFunction(I_r_OJ, A_IK7,         'vars', {t, q});
fh_koerper_4    = matlabFunction(I_r_OE, A_IK4,         'vars', {t, q});
fh_koerper_6    = matlabFunction(I_r_OI, A_IK6,         'vars', {t, q});


%% numerische Integration:
t_start = 0;
t_end   = 4;
x0      = [0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0];  % Anfangswerte erweitern 
options = odeset('RelTol',1.e-4,...   % Standard 1.e-3
                 'AbsTol',1.e-7,...   % Standard 1.e-6
                 'OutputFcn',@odeplot);
h=figure;
tic
[t,x_] = ode23(@ode_fcn,[t_start t_end],x0,options);
toc
close(h);

% q_pp bestimmen:
for i=1:length(t)
  x__p(i,:)=ode_fcn(t(i),x_(i,:)');
end
q    = x_(:,        1:p.n);
q_p  = x_(:,  (p.n+1):p.n*2);
q_pp = x__p(:,(p.n+1):p.n*2);

% Beschleunigung in P:
for i=1:length(t)
  a_p(i,:)=p.fhandle_ap(q(i,:)',q_p(i,:)',q_pp(i,:)')';
end



% Animation
figure;
animation4(t,x(:,1:13),.05,{fh_boden_fix    boden_fix    4;...
                           fh_boden_u      boden_u      4;...
                           fh_karosserie_1 karosserie_1 3;...
                           fh_hebel_2      hebel_2      2;...
                           fh_hebel_3      hebel_3      2;...
                           fh_koerper_4    koerper_4    2;...
                           fh_hebel_5      hebel_5      2;...
                           fh_koerper_6    koerper_6    2;...
                           fh_hebel_7      hebel_7      2},[0,90]);

[Sindar]

This error message is telling you that you are trying to index an element that doesn't exist. The first thing I'd do in this case is debug the code (https://www.mathworks.com/help/matlab/matlab_prog/debugging-process-and-features.html), pausing just before line 501. Then, run

size(x)

More specifically, are you sure it shouldn't be x_(:,1:13)?

[Walter Roberson]

The code doesn't define x