Saving FOR loop values to an array

Hello, I'm relatively new to MATLAB and having difficulty taking a value generated by a for loop and saving that to one spot in an array. What I want to do is save the result of the variable after each iteration of the for loop to a different point in the array. The code is designed to calculate the mass of a rocket as it burns fuel, and the BurnTime and resolution variables are there so the loop gives outputs from 0 to 2 seconds at 0.1 second intervals. I have been able to get each individual value of CurrentMass to display in the command window (also included in the code here) but whenever I try to save them to the array it says "array indices must be positive integers or logical statements".

BurnTime = 2;           
resolution = 0.1;

for t = 0:resolution:BurnTime  
    
    BurnRate = (-(MFuel)/BurnTime);
    CurrentMass = (MRocket + MFuel) + (BurnRate * t);
    Drag = 0.6 * (CurrentVelocity)^2;
    Acceleration = ((Thrust - CurrentMass) + (Gravity + Drag))/CurrentMass;
    CurrentVelocity = PreviousVelocity + t * Acceleration;
    CurrentHeight = CurrentVelocity * t;
    
    massArray(t) = CurrentMass;
    
    fprintf("\n \tFor t = %.2f \n", t);  %output mass calculation
    fprintf("\tCurrent Mass : %.2f \n", CurrentMass);
    
end

Thanks in advance for any help.

Answer 1

[Torsten]

T = 0:resolution:BurnTime;
nt = numel(T);
for i = 1:nt
    t = T(i);
    BurnRate = (-(MFuel)/BurnTime);
    CurrentMass = (MRocket + MFuel) + (BurnRate * t);
    Drag = 0.6 * (CurrentVelocity)^2;
    Acceleration = ((Thrust - CurrentMass) + (Gravity + Drag))/CurrentMass;
    CurrentVelocity = PreviousVelocity + t * Acceleration;
    CurrentHeight = CurrentVelocity * t;
    
    massArray(i) = CurrentMass;
    
    fprintf("\n \tFor t = %.2f \n", t);  %output mass calculation
    fprintf("\tCurrent Mass : %.2f \n", CurrentMass);    
end

[Lukas Blake]

Works perfectly. Thanks

[Image Analyst]

You might want to use k instead of i. We usually recommend not to use i or j to avoid confusion with the imaginary constant sqrt(-1).