Warning: Escape sequence ' ' is not valid. See 'help sprintf' for valid escape sequences

2014 3 20
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更新时间：2016 1 25
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Im trying to create a function that changes the destination folder for some data put into a text file, trouble is that when I try to input an address such as J:\My_Documents\MATLAB into an inputdlg box, and then use sprintf on the answer so that it can be used in
filename = fullfile('Destination','Filename.txt');
sprintf thinks that the \'s in the destination name mean things like \n and \t so it gives me an error saying:
Warning: Escape sequence 'M' is not valid. See 'help sprintf' for valid escape sequences.
and sprintf itself only outputs 'J:' and not the whole destination name is there anyway I can I can change a written answer from an inputdlg box to a useful form for my purpose that doesn't try to do any unwanted formatting on it?

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Star Strider
Star Strider 2014-3-20
You may need to provide more information. I can’t reproduce your problem (R2013b). This code:
Destination = inputdlg({'Destination'})
s = sprintf('%s', char(Destination))
produces this output for s:
s =
J:\My_Documents\MATLAB
with no errors.
Noam Greenboim
Noam Greenboim 2014-9-16
编辑：Noam Greenboim 2014-9-16
I had a similar warning. look at your backslashes (\) maybe you forgot to add a valid letter after them (like \n, \t, etc.).
In this case, the backslash is a part of the string that you want to print. Use double backslash (\\) to print one backslash.
For example: look at the difference between:
fprintf('\nHello')
and
fprintf('\\nHello')
David Young
David Young 2014-9-16
Star Strider: I don't understand what sprintf is doing here. Isn't it the case that for any string s, sprintf('%s', s) is equal to s? So wouldn't
s = char(Destination);
be simpler? Have I missed something?
Guillaume
Guillaume 2014-9-16
Yes, sprintf('%s', s) doesn't do anything. Usually if you use the %s it's to insert a string into another.
For that matter, the char(s) is also useless, since the values returned by inputdlg are already strings, so
s = Destination;
Would work just as well and you might as well use Destination directly.

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Image Analyst
Image Analyst 2014-9-16

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Just avoid the situation in the first place . Use forward slashes /. Windows understands them just fine - no problem whatsoever. Perhaps that's not widely known, but yes, Windows is perfectly happy to use /, at least in MATLAB and Windows Explorer. You don't need to use backslashes at all, so don't.

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