How can I store the value of variable 'dist_5thw​heel_to_se​cond_axle_​sem2_itr' in array/vector format with every for loop iteration such that previous value stays as well? ?

dist_5thwheel_to_second_axle_sem2_itr = [7.13, 7.63];

dist_front_trailer_to_5thwheel_sem2_itr = [1.368, 1.668]; %variable whose value needs to be stored with each iteration

counter1 = length(dist_5thwheel_to_second_axle_sem2_itr);

counter2 = length(dist_front_trailer_to_5thwheel_sem2_itr);

a1 = zeros(1,4); %total number of simulation runs are 4, so preallocating with size 4 row-vector

for i1 = 1:counter1 %counter for parameter1

dist_5thwheel_to_second_axle_sem2 = dist_5thwheel_to_second_axle_sem2_itr(i1);

for i2 = 1:counter1 %counter for parameter2

dist_front_trailer_to_5thwheel_sem2 = dist_front_trailer_to_5thwheel_sem2_itr(i2);

a1 = dist_5thwheel_to_second_axle_sem2_itr(i1) ; %a1 should store all the values previous and updated

%assigniing the simulation parameters to base workspace

assignin('base','tmax',tmax);

assignin('base','dt',dt);

assignin('base','Vx',Vx);

assignin('base','X0',X0);

assignin('base','rdfname',rdfname);

assignin('base','rdfname_inner',rdfname_inner);

assignin('base','steer_input',steer_input);

assignin('base','brake_input',brake_input);

assignin('base','throttle_input',throttle_input);

assignin('base','Vx_input',Vx_input);

assignin('base','end_posy',end_posy)

assignin('base','steer_sens_c',steer_sens_c);

assignin('base','steer_ratio',steer_ratio);

assignin('base','steer_control',steer_control);

assignin('base','path_input',path_input);

assignin('base','lookahead_time',lookahead_time);

assignin('base','T_lag',T_lag);

modelname = 'SEC_final';

sim(modelname,[],simset('DstWorkspace','base'));

evalin('base',['save ..\simresults\',modelname,' s VR dt'])

end

end

Answer 1

[Scott MacKenzie]

You've got a bug in the setup of your loops. For the inner loop, change

    for i2 = 1:counter1 

to

    for i2 = 1:counter2

As for maintaining the values of a1 from iteration to iteration, here's a simple way to do this that avoids pre-allocation. In the line before the outer loop begins, change

a1 = zeros(1,4);

to

a1 = []; % create a1, empty at first

Then, change the assignment to a1 in the inner loop to

a1 = [a1 dist_5thwheel_to_second_axle_sem2_itr(i1) ; 

Do this, and you'll achieve the objective stated in your question.

[MAYANK DHYANI]

Dear @Scott MacKenzie Thankyou for your valuable input. The counter1 was a typo in inner loop. The main point was that I had not been assigning the array a1 properly i.e., a1 = [a1 dist_5thwheel_to_second_axle_sem2_itr(i1) ;

The issue is resolved now.

[Scott MacKenzie]

You're welcome. Glad to help. Good luck.