How to replace some lines in a file with lines of another file?

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Kona 2016-2-23

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https://ww2.mathworks.cn/matlabcentral/answers/269585-how-to-replace-some-lines-in-a-file-with-lines-of-another-file

回答： Amos 2016-2-23

I have a file1 with 162000 lines and i want to replace some of them. I also have another file2 with 1600 lines that i will use to replace the lines of file1. I Know for example that first line of file2 will replace 105586 line of file1, second line will replace 104759 line, etc... I also have a third file3 with these numbers (105586,104759,...). The code i tried to use is:

N_lines=162000

M_lines=1600

fin=fopen('/my_path/file3','r');

for i=N_lines;

data=fgets(fin);

for j=M_lines;

file1(data,:)=file2(j,:);

end;

However, this error occurs: Subscripted assignment dimension mismatch.

Can anyone help me with this problem?

Thank you in advance!

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Amos 2016-2-23

What is the data in your files? Is it numbers? If it is a file containing numbers in a regular pattern, say with m rows and n columns, then one could also use commands like "dlmread".

Kona 2016-2-23

Thank you for your answer.All data in files are numbers and files are .csv.

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Answer 1

Amos 2016-2-23

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在 MATLAB Online 中打开

Maybe something like:

line_numbers = dlmread('file3');
data1 = dlmread('file1');
data2 = dlmread('file2');
for i=1:length(line_numbers)
  data1(line_numbers(i),:) = data2(i,:);
end
dlmwrite('file1_modified',data1);