How do I get values of for loop into a vector?

Hello everyone i have two questions

1) If i want to get my values from my for loop into a vector how do i do this without getting a large vector of zeros?

2) If i wanted to do a nested for loop to have r change as well, how could i do this?

Here is my code:

for r = .175  

      Bi=(h*r)/k; %Biot Number equation
      l=1.0904; %Lambda value for now
      A1=1.1548; %A1 value for now
      L=.175;
          for t=[300,600,900,1200,1800,2400,3000,3600,5400];
          L=.175;
          T1= (Ti-Tinf)*A1*exp((-(l^2)*((a*t)/L^2)))+Tinf
          end

end

for the inner for loop, when i try to put T1(t) to get a vector i get a large vector of 5400 values (my last value of t), which contains mostly zeros. Also, for my outer loop, i want to different values of r, which would then change the l and A1 values that i plug into my T1 equation. How could i go about doing this?

All help is appreciated. Thank you.

Answer 1

[James Tursa]

Is there some reason you want or need to use a loop for this? E.g., using vectorized code your inner loop can be reduced to this (T1 will be a vector result):

          t=[300,600,900,1200,1800,2400,3000,3600,5400];
          T1 = (Ti-Tinf)*A1*exp((-(l^2)*((a*t)/L^2)))+Tinf

Caveat: If other variables are vectors, then other adjustments would need to be made to this assignment (e.g., may need to change some * and / operators to element-wise .* and ./ operators, or use bsxfun, etc.)