How to index for saving an output of a for loop for each loop?

Question

Wolfgang McCormack 2021-3-13

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/771898-how-to-index-for-saving-an-output-of-a-for-loop-for-each-loop

评论： Sergey Kasyanov 2021-3-13

Hi all, I have the following code and I want to save the output but how?

for i = 0.1:0.1:0.7
    'Calculating somestuff here'
    
    'S = output of modifications which is a 4 x 1 array'
    
    'Now I want to wrtie the output to an array but I cannot use i because it's fractional'
    
    Saved(:,i) = s 'but it does not work'
end

I tried this but no help:

for z = 1:100
for i = 0.1:0.1:0.7
    'Calculating somestuff here'
    
    'S = output of modifications which is a 4 x 1 array'
    
    'Now I want to wrtie the output to an array but I cannot use i because it's fractional'
    
    Saved(:,z) = s 'but it does not work'
end
end

I will definitely appreciate your help!

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Answer 1

Sergey Kasyanov 2021-3-13

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/771898-how-to-index-for-saving-an-output-of-a-for-loop-for-each-loop#answer_647028

编辑：Sergey Kasyanov 2021-3-13

Hello,

try that

I = 0.1:0.1:0.7;

Saved = zeros(4,length(I));

for i = 1:length(I)

'Calculating somestuff here'

'Use I(i) instead i'

Saved(:,i) = S;

end

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Wolfgang McCormack 2021-3-13

@Sergey Kasyanov thank you Sergey! Worked like a charm! Just two quick question. So, as it is checking an if statement and then saves, when the first three logical index do not match the if, 0s are shown until it reached a column where the if statement matches the output. How can I ignore 0s in the saved file and have only the actual values?

Second, I am saving an output which is 4x1. How can I save it vertically(row wise but in each 4 row can only be one output as the output is 4x1) instead of columns wise?

Thank you so much!

Sergey Kasyanov 2021-3-13

All problems can be solved in slow but working way

I = 0.1:0.1:0.7;

Saved = [];

for i = 1:length(I)

'Calculating somestuff here'

'Use I(i) instead i'

Saved = [Saved; S'];

end

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How to index for saving an output of a for loop for each loop?

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How to index for saving an output of a for loop for each loop?

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