Use dlmwrite without \n

Question

Kian 2015-8-13

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/233567-use-dlmwrite-without-n

评论： Kian 2015-8-13

I am trying to use dlmwrite. My foo.obs has 3 rows of text before my data starts: 2 lines of title, and then my header line. I want each line to start at a new line, but then my header line to be tab delimited.

I don't want to use \n as it will cause a ^M to show up when I open the file on Unix.

The following code almost does that, expect that my headers also goes into different lines. I want all my header in the same line and tab delimited.

fnam='foo.obs';
title1 = {'Line 1'};
title2= {'Here is a new line'};
hdr={'H1','H2','H3'};
txt=sprintf('%s\n',title1{:},title2{:},hdr{:});
txt(end)='';
dlmwrite(fnam,txt,'');

Any ideas would be greatly appreciated.

Thanks

2 个评论
显示无隐藏无

per isakson 2015-8-13

在 MATLAB Online 中打开

Replace

txt=sprintf('%s\n',title1{:},title2{:},hdr{:});

by

txt=sprintf('%s\n%s\n%s,%s,%s\n',title1{:},title2{:},hdr{:});

returns

>>  txt
txt =
Line 1
Here is a new line
H1,H2,H3

Is that what you want?

Kian 2015-8-13

编辑：Kian 2015-8-13

Thank you and yes, sort of.

Just that I don't want comma but tab between my headers. I can replace , with \t in there. But is there any way I instead of tab I can insert a single space between my headers?

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Walter Roberson 2015-8-13

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/233567-use-dlmwrite-without-n#answer_189151

dlmwrite() does not support mixing text with numeric values. It does not support text headers followed by numeric data.

The workaround is to create the file ahead of time writing whatever header you want to it. Then dlmwrite() the numeric data specifying the '-append' option.

The default line terminator for dlmwrite is \n with no carriage return, and it opens the output for binary not for text so it does not automatically use \r\n on text files if you are running on MS Windows. If you want \r\n used as the end of line then you need to use the option 'newline', 'pc' .

\n does not become ^M on Unix: only \r shows up as ^M. If you open a file for writing on MS Windows as a text file (e.g. you specified 'wt' or 'at' but not just 'w' or 'a'), then each \n will be converted to \r\n by the I/O library. This does not apply on OS-X or Linux (Unix systems), and does not apply to dlmwrite() because dlmwrite() opens the files in binary rather than as text.

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Kian 2015-8-13

Thanks a lot for your explanations. Actually that's what I was initially doing. I had my file with text created ahead of time, and append my data to it. The problem was that I was creating my file using 'wt'. I changed it to 'w' and ^M goes away.

Thank a lot for your input,

Kian

请先登录，再进行评论。