saving and writing variables in files

Hi

I am using a main function ..In that function, in a loop I am calling another function...In that another function there are 4 varaibles that need to be updated and i want to load values of these variables in every iteration ...how to do that...please note I am using ode15i...in which for rxample if the loop runs from t=0 to t=20 with step size of 1...Now say, The values of those 4 variables keeps on updating multiple times at t=0 instant till the consistent results have been achieved...and i want to store values of those values

currently I am doing this..........

fuction main()
for i=1:1:400
to=tdash(i);
[yo_new,ypo_new] = decic(@(t,y,yp)tryingode(t,y,yp),to,yo,[fixed_yo],ypo,[]);
[sol] = ode15i(@(t,y,yp)tryingode(t,y,yp),[0 20],yo_new,ypo_new);
[y,yp]=deval(sol,tdash(i));
si=y(2); % stress
T=y(1);
zo=y(3);
zso=y(4);
% 
[yo]=[T si zo zso];
[ypo]=[yp];
end 
function dydt=tryingode(t,y,yp)
persistent sij Tj zj zsj         % I dont want to use persistent 
if isempty(sij)     % For the first time 
sij=80;
Tj=26;
zsj=0.71 ;
zj=1;
end 
if (y(2)+Ca*(Af-y(1)))>=0 && (y(2)+Ca*(As-y(1)))<=0 && alpha>=-(pi-phia)&& alpha<=phia % Ca Af As phia =constant .....alpha =atan(yp(2),yp(1)) 
else 
sij=y(2);  % Want to store these values in files and then call these values in next iteration
Tj=y(1);
zj=y(3);
zsj=y(4);
end 

Any method to avoid persistent .......Here at start , my assumed values lead me to else condition of function and I get updated value of sij Tj zj zsj but when if condition follows the persistent values makes values vary differently.......is there any other method .....What I am thinking is ...if there is any means where i can save these sij Tj zj zsj values (may be in a file ) and instead of making them persistent variables, I call the previous value in function from file.......(first write to file sij etc values in local function and then read those save values in files when local function is called in next iteration)?

I hope my question is clear ...

[Stephen23]

Earlier (almost identical) question with answers:

https://www.mathworks.com/matlabcentral/answers/610541-substitute-of-persistent-command