textread behaves differently when file resaved

Question

Akshay Jain 2015-3-6

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https://ww2.mathworks.cn/matlabcentral/answers/181777-textread-behaves-differently-when-file-resaved

编辑： per isakson 2015-3-12

Hello,

I have a not standard format (MRI scanner) file for which I use textread function to read the header. When I use the following command directly on the file, I do not get the full content of the file:

textread('foo','%s', 'delimiter','\n','bufsize', 500000);

However, if I open the file in matlab text editor, make some change, save the file, undo the change and re save it, I get different output (which is correct).

I am assuming there is some problem with the format it was saved originally.

Can anyone help me understand this problem ?

Thanks, Akshay

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Answer 1

Akshay Jain 2015-3-12

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https://ww2.mathworks.cn/matlabcentral/answers/181777-textread-behaves-differently-when-file-resaved#answer_171119

Couldn't figure out the real reason for the problem, but using textscan in place of textread solved it.

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Answer 2

Jan 2015-3-6

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https://ww2.mathworks.cn/matlabcentral/answers/181777-textread-behaves-differently-when-file-resaved#answer_170307

It is impossible to guess the differences between the two files. But you can find them. Save the modified file under a new name and use the tool of the editor to compare files. Or e.g. WinDiff or a similar tool.

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Answer 3

Akshay Jain 2015-3-6

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https://ww2.mathworks.cn/matlabcentral/answers/181777-textread-behaves-differently-when-file-resaved#answer_170345

Thanks. I tried comparing them using Kdiff but they look exactly same. Actually there are some differences but I am guessing that's because of some non text (binary, so text editors read them as special characters) information stored in the two files. I could have posted the files, but I am not sure if I am allowed to.

I am thinking of a work around, is there a way I can open the files using some command, edit first line and re save them ? Just to get it working.

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Answer 4

Akshay Jain 2015-3-6

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https://ww2.mathworks.cn/matlabcentral/answers/181777-textread-behaves-differently-when-file-resaved#answer_170347

Another observation, it only works when I open, edit, save, undo, re save in matlab text editor. I tried doing the same thing in notepad, but it doesn't help. So apparently Matlab is doing something while saving it.