Difference between revisions of "MATLABUnicodePath"

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Sometimes odd characters or characters with accents prevent MATLAB from opening a file, even if you copy the filename directly from Windows explorer: "04%10%08@1443"
 +
 
 +
We can use a short function to retrieve a list of all files in a certain folder:
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<syntaxhighlight lang="matlab">
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function contents = dir2(path, filter, ignore_dot)
 +
%
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% dir2 list contents on path recursively, using java.io.File, so  
 +
% weird characters are converted correctly to MATLAB usuable
 +
% path names.
 +
%
 +
% filter - string, expression used to filter file names
 +
% ignore_dot - ignore files and folders beginning with .
 +
%
 +
% mw 10 11 2014 - creation
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 +
if nargin < 2, filter = '.*'; end
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if nargin < 3, ignore_dot = 1; end
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 +
f = java.io.File(path);
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fs = f.listFiles();
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contents = {};
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for i=1:length(fs)
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    fname = fs(i).getName().toCharArray()';
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    abspath =  fs(i).getCanonicalPath().toCharArray()';
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    if ignore_dot && fname(1) == '.'
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        continue
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    end
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    if fs(i).isDirectory()
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        subcontents = dir2(abspath, filter, ignore_dot);
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        contents = {contents{:} subcontents{:}};
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    end
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    match = regexp(fname, filter, 'ONCE');
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    if match
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        contents = {contents{:} abspath};
 +
    end
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end
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</syntaxhighlight>
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The resulting list of files can be filtered with a [http://www.mathworks.fr/help/matlab/ref/regexp.html regular expression], so that you have exactly the files you're looking for:
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<syntaxhighlight lang="matlab">
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>> path = 'Y:\MEG\DATA\Protocoles_epilepsie\epil\epil_003\cont3mtr';
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>> re = 'c,rf.*Hz$';
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>> fs = dir2(path, re);
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</syntaxhighlight>
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Here, the regex says find filenames starting with "c,rf", then any character, then "Hz" then end of line "$". We can check the results:
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<syntaxhighlight lang="matlab">
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>> for i=1:length(fs), fprintf('%s\n', fs{i}); end
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Y:\MEG\DATA\Protocoles_epilepsie\epil\epil_003\cont3mtr\03%11%08@1035\1\c,rfhp1.0Hz
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Y:\MEG\DATA\Protocoles_epilepsie\epil\epil_003\cont3mtr\03%11%08@1035\2\c,rfhp1.0Hz
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Y:\MEG\DATA\Protocoles_epilepsie\epil\epil_003\cont3mtr\03%11%08@1035\3\c,rfhp1.0Hz
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Y:\MEG\DATA\Protocoles_epilepsie\epil\epil_003\cont3mtr\03%11%08@1035\4\c,rfhp1.0Hz
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Y:\MEG\DATA\Protocoles_epilepsie\epil\epil_003\cont3mtr\03%11%08@1035\5\c,rfhp1.0Hz
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</syntaxhighlight>

Latest revision as of 12:17, 10 November 2014

Sometimes odd characters or characters with accents prevent MATLAB from opening a file, even if you copy the filename directly from Windows explorer: "04%10%08@1443"

We can use a short function to retrieve a list of all files in a certain folder: 

function contents = dir2(path, filter, ignore_dot)
%
% dir2 list contents on path recursively, using java.io.File, so 
% weird characters are converted correctly to MATLAB usuable 
% path names.
%
% filter - string, expression used to filter file names
% ignore_dot - ignore files and folders beginning with .
%
% mw 10 11 2014 - creation
 
if nargin < 2, filter = '.*'; end
if nargin < 3, ignore_dot = 1; end
 
f = java.io.File(path);
fs = f.listFiles();
contents = {};
for i=1:length(fs)
    fname = fs(i).getName().toCharArray()';
    abspath =  fs(i).getCanonicalPath().toCharArray()';
    if ignore_dot && fname(1) == '.'
        continue
    end
    if fs(i).isDirectory()
        subcontents = dir2(abspath, filter, ignore_dot);
        contents = {contents{:} subcontents{:}};
    end
    match = regexp(fname, filter, 'ONCE');
    if match
        contents = {contents{:} abspath};
    end
end

The resulting list of files can be filtered with a regular expression, so that you have exactly the files you're looking for: 

>> path = 'Y:\MEG\DATA\Protocoles_epilepsie\epil\epil_003\cont3mtr';
>> re = 'c,rf.*Hz$';
>> fs = dir2(path, re);

Here, the regex says find filenames starting with "c,rf", then any character, then "Hz" then end of line "$". We can check the results: 

>> for i=1:length(fs), fprintf('%s\n', fs{i}); end
Y:\MEG\DATA\Protocoles_epilepsie\epil\epil_003\cont3mtr\03%11%08@1035\1\c,rfhp1.0Hz
Y:\MEG\DATA\Protocoles_epilepsie\epil\epil_003\cont3mtr\03%11%08@1035\2\c,rfhp1.0Hz
Y:\MEG\DATA\Protocoles_epilepsie\epil\epil_003\cont3mtr\03%11%08@1035\3\c,rfhp1.0Hz
Y:\MEG\DATA\Protocoles_epilepsie\epil\epil_003\cont3mtr\03%11%08@1035\4\c,rfhp1.0Hz
Y:\MEG\DATA\Protocoles_epilepsie\epil\epil_003\cont3mtr\03%11%08@1035\5\c,rfhp1.0Hz
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