Save file with different extension

2012 12 11
1 个回答
回答已采纳
8 次查看（30 天）

0 个投票

Hi,
I am a newbie and am opening some files, adding some lines, then saving the files. I can't figure out how to save each file I open with a new extension while keeping the filename the same.
Here is how I am opening the files:
DefaultFile='';
[FileName,PathName] = uigetfile('*.*','Select File to Plot',DefaultFile); %choose file to open.
%%%%**************** Read the File *************
fid=fopen(fullfile(PathName,FileName));
To save the file do I use the following fopen and if so what do I put where the question marks are?
fileID = fopen(??????,'w');
Thanks

请先登录，再回答此问题。

 采纳的回答

Image Analyst
Image Analyst 2012-12-11

2 个投票

You have another fopen() to open an output file. Your question marks should be replaced by the full file name of your output file. You can use sprintf() (if needed) and fullfile() to create that output file name. Then use fprintf to write text to it. Then call fclose() to close the two files.

7 个评论
显示 5更早的评论 隐藏 5更早的评论

AsYouWish
AsYouWish 2012-12-11
Not sure I completely understand but here is what I did.
1. I replaced the question marks with FileName
fileID = fopen(FileName,'w');
2. The file was saved but with the original name AND extension. How do I replace the original extension with a new one (say data.dat to data.txt)
Thanks.
AsYouWish
AsYouWish 2012-12-11
I just tried this:
[pathstr, name, ext] = fileparts(FileName)
Which worked to separate the file name from the extension. Now, how do I print the file by concatenating the name with the extension?
This saves the file without the extension. How do I add a ".txt" extension?
fileID = fopen(name,'w');
Thanks.
UJJWAL
UJJWAL 2012-12-11
you can use horzcat(name,newext) , where newext is the new extension u wanna give.. and then fileID = fopen(horzcat(name,newext),'w');
AsYouWish
AsYouWish 2012-12-11
Thanks. Just before you answered I used:
fname = strcat(name, '.txt');
fileID = fopen(fname,'w');
Thanks everyone for their help.
Image Analyst
Image Analyst 2012-12-11
I'd do
[folder, oldBaseName, oldExt] = fileparts(oldFileName);
newBaseName = sprintf('%s.txt',oldBaseName);
newFullFuleName = fullfile(folder, newBaseName);
AsYouWish
AsYouWish 2012-12-11
Thanks. I used that and it makes it easier to identify original and new file names when looking at the code.
Jan
Jan 2012-12-12
@AsYouWish: Please accept this answer, if it solves your problem. Thanks.

请先登录，再进行评论。

更多回答（0 个）

类别

在 帮助中心 和 File Exchange 中查找有关 Language Support 的更多信息

产品

标签

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by