For loop stops after one step

Question

Avik Mahata 2021-8-25

0
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https://ww2.mathworks.cn/matlabcentral/answers/1440544-for-loop-stops-after-one-step

评论： Avik Mahata 2021-8-25

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

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Answer 1

Steven Lord 2021-8-25

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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