Multiple outputs by a loop

Question

Ivan Mich 2020-5-16

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/525922-multiple-outputs-by-a-loop

评论： Stephen23 2020-5-16

Hello, I have a question. I would like to create multiple files(outputs) by a loop. File parameters.txt has two lines. I would like to create files with name output1 and output2, by a loop. My commands are these:

Param=regexp(fileread('parameters.txt'), '\r?\n', 'split') .'; 
for i=1:size()
fid = fopen( 'output%d', 'w');
fprintf(fid,'%s\n')
fclose(fid)
end

But I do not know how to make it . Could you help me?

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Stephen23 2020-5-16

在 MATLAB Online 中打开

Note that with out a third (or more) input argument this will not print anything:

fprintf(fid,'%s\n')

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Ajay Kumar 2020-5-16

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/525922-multiple-outputs-by-a-loop#answer_432807

编辑：Ajay Kumar 2020-5-16

在 MATLAB Online 中打开

Param=regexp(fileread('parameters.txt'), '\r?\n', 'split') .'; 
for i=1:size()
fid = fopen( ['output',i,'.txt'], 'w');
fprintf(fid,'%s\n')
fclose(fid)
end

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Stephen23 2020-5-16

在 MATLAB Online 中打开

This will not work as expected.

Lets look at the actual output character vector when i=1:

>> i = 1;
>> double(['output',i])
ans =
   111   117   116   112   117   116     1

Those are the printable characters 'o', 'u', 't', 'p', 'u' and 't', followed by the unprintable "Start of Heading" control character. I doubt that that is very useful, or intended.

请先登录，再进行评论。

Answer 2

Stephen23 2020-5-16

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/525922-multiple-outputs-by-a-loop#answer_432808

编辑：Stephen23 2020-5-16

在 MATLAB Online 中打开

Replace the fopen with these two lines:

fnm = sprintf('output%d.txt',i);
fid = fopen(fnm,'wt');

2 个评论
显示无隐藏无

Ivan Mich 2020-5-16

OK, but in this code I am making some calculations. I want in these two output files to be contented the result of these calculations.

How could I do this?

Stephen23 2020-5-16

"How could I do this?"

This is very general question: it is not clear which of the many steps involved you are asking about.

You don't explain what "calculations" are involved, so clearly I can't help with that. You don't even say what class or size the data arrays are, so I can't help you with selecting a suitable method to save your data.

If you want to export multiple files in a loop then you should pick a suitable function (which might be fprintf as your question shows):

https://www.mathworks.com/help/matlab/data-import-and-export.html

and follow the examples here

https://www.mathworks.com/help/matlab/import_export/process-a-sequence-of-files.html

Read the sprintf documentation to know how to specify the format string for the filenames:

https://www.mathworks.com/help/matlab/ref/sprintf.html

Read the size documentation to know how to measure the dimensions of an array:

https://www.mathworks.com/help/matlab/ref/size.html

请先登录，再进行评论。