How to write to a fopen text file in a new row without deleting previous text?

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Shel 2018-12-3

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https://ww2.mathworks.cn/matlabcentral/answers/433588-how-to-write-to-a-fopen-text-file-in-a-new-row-without-deleting-previous-text

回答： Jan 2018-12-3

I have doing a series of computation by matlab and for that I have 400 files (to do the proces on) and I am going to write a loop to do the same process several times ... I want the new results to be written in the same file but in a new row, can you please help me how I can do so?

Thanks,

Attachement:he result of my file for the first number of loop. .. I want the new results (500 number of calculation) to be printed in new 500 columns beside these dta.

now I use this command:

H='result.txt';
file1=fopen(H,'w');
%the commands
fprintf(file1,'%1.0f %5s %6.1f %15s %6.1f %15s %6.0f %15s %-6.0f %15s %6.3f  \r\n',i, '', area,'',mean,'',mmax,'',mmin, '', proportion);

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Shel 2018-12-3

actually, I have not used dlmwrite before, how can I use it?

I mean as I read the reference page, it should be like dlmwrite(filename, M, '-append') and M should be a predefined data, matrix ...

but in my case I should calculated each data of a row seperately for a series of my data (that is image) ... so is it possible to write each value calculated for an image like what I have done with fprintf during the calculation?

can you guide me more on this please?

madhan ravi 2018-12-3

在 MATLAB Online 中打开

you can calculate the values totally and store it as a matrix and then write it to a file but if you insist ...

yes you can do it for instance

inside loop

m = .... % contains some elements   % here you don't have to save m in each iteration because you write it in the file
dlmwrite('sample.txt',m,'Delimiter', ' ' , '-append')