For loop stops after one step

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Avik Mahata
Avik Mahata on 25 Aug 2021
Commented: Avik Mahata on 25 Aug 2021
Why does the below for loop stops after one step? L is a up to 1000. So I am expecting to get a matrix with 1000 rows. Thanks in advance for any suggestions.
for i=1:L
X= ((data_P_H2O(1,3).*data_P_NaF(i+1,3))-(data_P_NaF(1,3).*data_P_H2O(i+1,3)))*0.5 ;
Y = ((data_P_H2O(1,4).*data_P_NaF(i+1,4))-(data_P_NaF(1,4).*data_P_H2O(i+1,4)))*0.5 ;
Z = ((data_P_H2O(1,5).*data_P_NaF(i+1,5))-(data_P_NaF(1,5).*data_P_H2O(i+1,5)))*0.5 ;
PhiIW= X + Y + Z;
end

Accepted Answer

Steven Lord
Steven Lord on 25 Aug 2021
What makes you believe the loop stops after one step? Were you expecting PhilW to contain the sum of X, Y, and Z for each element of i? As written at each iteration you're overwriting the previous value of PhilW with the new value.
Compare:
for k = 1:10
x = k.^2; % Overwrite
y(k) = k.^2; % Append
end
x
x = 100
y
y = 1×10
1 4 9 16 25 36 49 64 81 100
  1 Comment
Avik Mahata
Avik Mahata on 25 Aug 2021
Well y(k) worked. I didn't realized I am not indexing each of the rows for it save the results in a matrix. Thanks for taking time to respond.

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