for loop store data in 2d array

I need to store the data in an array. I have a plot Y versus the time (tfinal =m) and the Y value is calculated n-times from a n-loop. I need to store the data in mxn array The part of the m.file are the following

index=0
for i=1:Loop
  t=0; %start time 
  t_end=40; %end time
  t_sample=1; %sample interval for gathering data
  ........
j=1; 

t_ar(1,t_end/t_sample+1)=0; 
t_ar(1,j)=t; 
Y1_ar(1,t_end/t_sample+1)=0; 
Y1_ar(1,j)=Y1; 
etc etc

end

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