How do i connect and running different loop at the same time?

please help, i want to run Loop 1 (i.e: n=2) but the equation need output from Loop 2 (n = n-1), so while i calculate Loop 1 i need data from Loop 2 that running at the same time.

i planning to put another Loop 3 to y.

t actually is time domain in my equation.

How can i connect those two loops? should i use another way?

clear
clc

t = linspace(0,10,5);
y = [ 3 2 1 4 5 ];
rudAngle0 = 0;


% 1st Loop
for n = [ 1:length(t) ]
    
    disp("running " + n)
    indexnya = n;
   
    if n == 1
         disp("output running  " + n)
         L = rudAngle0;
    
    else
        disp("output running  " + n)
        L = final_loop1(n-1) + final_loop2(n-1)
    end
final_loop1(n) = L   
end


% 2nd Loop
for n = [ 1:length(t) ]
    
    disp("running  " + n)
    indexnya = n;
   
    if n == 1
         disp("output running  " + n)
         L = 0;
    
    else
        disp("output running  " + n)
        L = final_loop1(n-1) + y(n-1)
    end
final_loop2(n) = L   
end

Answer 1

[Voss]

Combine the two loops into one loop, so that they actually run at the same time:

t = linspace(0,10,5);
y = [ 3 2 1 4 5 ];
rudAngle0 = 0;

nt = length(t);
final_loop1 = zeros(1,nt); % pre-allocate
final_loop2 = zeros(1,nt);

% Loop
for n = 1:nt
    
    if n == 1
        L1 = rudAngle0;
        L2 = 0;
    else
        L1 = final_loop1(n-1) + final_loop2(n-1);
        L2 = final_loop1(n-1) + y(n-1);
    end
    
    final_loop1(n) = L1;
    final_loop2(n) = L2;
    
end

final_loop1

final_loop1 = 1×5

0 0 3 5 9

final_loop2

final_loop2 = 1×5

0 3 2 4 9

You can simplify that loop by setting the first element of each vector before the loop, and then start the loop with n=2, and also get rid of temporary variables L1 and L2 by setting final_loop1(n) and final_loop2(n) directly:

t = linspace(0,10,5);
y = [ 3 2 1 4 5 ];
rudAngle0 = 0;

nt = length(t);
final_loop1 = zeros(1,nt); % pre-allocate
final_loop2 = zeros(1,nt);

final_loop1(1) = rudAngle0;
final_loop2(1) = 0;

% Loop
for n = 2:nt
    final_loop1(n) = final_loop1(n-1) + final_loop2(n-1);
    final_loop2(n) = final_loop1(n-1) + y(n-1);
end

final_loop1

final_loop1 = 1×5

0 0 3 5 9

final_loop2

final_loop2 = 1×5

0 3 2 4 9

[Rangga]

thanks a lot! it works in my code!

but i change my t to [1:700] and after the 6th loop and later it shows NaN

[Rangga]

and also it open workspacefunc.m and display this on command window

NaN/Inf breakpoint hit for workspacefunc.m on line 310.
310                 v = evalin('caller', varargin{1});

UPDATE

never mind, i got the code work, thanks!