Saving Cell array and String to text file.

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pr 2015-3-30

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https://ww2.mathworks.cn/matlabcentral/answers/195207-saving-cell-array-and-string-to-text-file

评论： Hamdullah Livaoglu 2018-6-4

采纳的回答： Jan

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I have a cell_in (combination of numeric, date&time & text data) of size mxn and need to save data in a text file.

Here is the code I have written and it works fine

fid = fopen(FilePath,'w');
for rows = 1:size(Cell_in,1)
fprintf(fid,'%s\n',Cell_in{rows,:});
end
fclose(fid)

Instead of doing it in a loop I changed it to string and saved data to text file using the following code

fid = fopen(FilePath,'w');
fprintf(fid,'%s\n',char(Cell_in));
fclose(fid)

and the text file is completely messed up. Am I doing something wrong?

1.If so what did I do wrong?

2. When loading a txt file to MATLAB one can extract the data as cell using

fid = fopen(FileName,'r');
txt_data = textscan(fid,'%s','delimiter','\n');
fclose(fid);

but why not the other way round is possible?

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Answer 1

Jan 2015-3-30

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fid = fopen(FilePath,'w');
CT = Cell_in.';
fprintf(fid,'%s\n', CT{:});
fclose(fid)

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pr 2015-3-31

编辑：pr 2015-3-31

@ Jan Simon and Konstantinos Sofos : Thank you for the solutions.

Hamdullah Livaoglu 2018-6-4

Thanks Jan we owe you big gratitudes:) Howeverit doesnt work in loop like this: fprintf(fid,'%5.4f %5.0f %5.2f %5.0f %5.0f %5.2f %s\n',[kappa;R;snr;fik;fek;cor;date{:}]); all variables are doubles except date. it gives:"Error using vertcat Dimensions of matrices being concatenated are not consistent." how can i handle this error?,

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Answer 2

Konstantinos Sofos 2015-3-30

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编辑：Konstantinos Sofos 2015-3-30

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Hi,

Can you try

fid = fopen(FilePath,'w');
fprintf(fid,'%s\n',cellfun(@(x) char(x),Cell_in,'UniformOutput',false));
fclose(fid)

or

fid = fopen(FilePath,'w');
fprintf(fid,'%s\n',char(cellfun(@(x) char(x),Cell_in,'UniformOutput',false)));
fclose(fid)

or you can convert to table and then export if you use R2013b or later

export-cell-array-to-text-file

Regards,

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Answer 3

Simon Wiedemann 2017-9-4

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Hello there,

i have a problem with writing many files.

There are some (~20) Text-Files with strings of different lenght. I need to copy these files multiple times and change 1-5 lines in the copied files.

Till now i load a File in a cell array, change the lines and write them back to a new file with function fprintf. This is very slow so it takes very long to do this for every file.

Is it possible to copy a file and then only change one line in the already stored file? And would that be faster? Or is a other faster way?

Best regards, Simon