How can I format columns when writing to a text file?

Question

Conor Dixon 2018-2-2

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https://ww2.mathworks.cn/matlabcentral/answers/380463-how-can-i-format-columns-when-writing-to-a-text-file

评论： Conor Dixon 2018-2-2

采纳的回答： Kyle Pastor

在 MATLAB Online 中打开

I have a 128x19461 double that I want to save as a text file.

I am using:

output = evalc('A'); % A is the matrix
fid = fopen('SamplesTimestampsnew.txt', 'wt');
fwrite(fid, output);
fclose(fid);

This saves it to the text document, but it formats it as "columns 1 through 6, columns 7 through 13" etc.

What am I missing here? Surely it must be simple! Thank you.

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Answer 1

Kyle Pastor 2018-2-2

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https://ww2.mathworks.cn/matlabcentral/answers/380463-how-can-i-format-columns-when-writing-to-a-text-file#answer_303227

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Hey Conor,

I think what is happening is that it is converting the output of printing A into the console as a block of text. So basically it is just showing you what Matlab would print on the console.

May I suggest the following:

Take your matrix of doubles (A) and convert it into a table
use the writetable(A) command,

Notes on table:

https://www.mathworks.com/help/matlab/matlab_prog/create-a-table.html

See code below:

A=rand(10,10); % Random 10x10 array of doubles
A = table(A); % converts it into a table (now you can even rename columns)
writetable(A,'./SamplesTimestampsnew.csv');

And there you should have a nice .csv formatted table!

Hope this helps!