Problem using 'dlmwrite' into .txt file which contains 19/20 digit intergers

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Apashanka Das 2021-12-10

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https://ww2.mathworks.cn/matlabcentral/answers/1607895-problem-using-dlmwrite-into-txt-file-which-contains-19-20-digit-intergers

评论： Apashanka Das 2021-12-11

采纳的回答： Chunru

I have a csv file (id.txt) which contains two columns having 19/20 digit integers.

I am executing the following commands in matlab workspace :-

(1) load id.txt

(2) dlmwrite('id_new.txt',id,'delimiter','\t','precision','%19i')

After executing the above commands, the last 3/4 digits of 2nd column in the file 'id_new.txt' gets changed, although the 1st column remains as it is. Can anyone please help me in sort out this problem.

The screenshots of two files id.txt and id_new.txt are attached herewith.

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Chunru 2021-12-10

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MATLAB double data type cannot hold so many digits in your imput data. It will round off the data to what-so-ever a double type can hold.

If you want to ensure that no information is lost, you can always read in the data as strings and then write the data as strings.

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Walter Roberson 2021-12-10

在 MATLAB Online 中打开

fid = fopen('A.txt');
A_data = cell2mat(textscan(fid, '%u64,%u64', 'headerlines',1));
fclose(fid)
fid = fopen('B.txt');
B_data = cell2mat(textscan(fid, '%u64', 'headerlines',0));
fclose(fid)
dlmwrite('id_new.txt',A_data, 'delimiter', '\t', 'precision', '%u')