summation with for loop for all rows in another column

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MUKESH KUMAR 2020-1-13

0
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https://ww2.mathworks.cn/matlabcentral/answers/500039-summation-with-for-loop-for-all-rows-in-another-column

编辑： Raj 2020-1-13

data.mat

I had following data as attached

h = 1;

I_all size(3154*20)

So hmax = 20;

I1 = I_all(1,1) for first row and I1=I_all(2,1) for 2nd row and so on........

Need F_HL for all 3154 rows..........

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Rik 2020-1-13

What have you tried so far? Especially the version with a for loop seems easy to implement.

MUKESH KUMAR 2020-1-13

在 MATLAB Online 中打开

h=1:20;
F_HL_N = 0;
for i=1:20
  
    F_HL_N = F_HL_N+(I_all(1,i)/I_all(1,1))^2* h(i)^2;
    
end
F_HL_D = 0;
for i=1:20
    
F_HL_D=F_HL_D+(I_all(1,i)/I_all(1,1))^2;
end
F_HL = F_HL_N/F_HL_D; % for first row 
% now want to do for all 3154 rows in for loop

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Answer 1

Raj 2020-1-13

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https://ww2.mathworks.cn/matlabcentral/answers/500039-summation-with-for-loop-for-all-rows-in-another-column#answer_409871

编辑：Raj 2020-1-13

在 MATLAB Online 中打开

You are almost there. Put the whole thing in another loop that runs accross all the rows and store F_HL for each row like this:

for ii=1:3154
h=1:20;
F_HL_N = 0;
for i=1:20
  
    F_HL_N = F_HL_N+(I_all(1,i)/I_all(1,1))^2* h(i)^2;
    
end
F_HL_D = 0;
for i=1:20
    
F_HL_D=F_HL_D+(I_all(1,i)/I_all(1,1))^2;
end
F_HL(ii) = F_HL_N/F_HL_D; % for iith row 
end