MATLAB: Changing from char variable to another input

charinputMATLABmatrix manipulationtext;

Forgive my naivity on this one. How can I change a 1×47004 char to a matrix which has letters/words in some cells and numbers in the rest? At present I have the following 6×6 cell.

1×47004 char [] [] [] [] []

1×45843 char [] [] [] [] []

1×46992 char [] [] [] [] []

1×46432 char [] [] [] [] []

1×46459 char [] [] [] [] []

1×48191 char [] [] [] [] []

Best Answer

Your *.mot files are coming in as one very long character array.

You can either try to parse it character-by-character into a cell array, or table, or structure, etc... OR import your data differently.

Try using the readtable function

https://www.mathworks.com/help/matlab/ref/readtable.html

Try this:

for i = 1 : nfiles
   data{i} = readtable(fullfile(testfiledir, matfiles(i).name));
end

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MATLAB: Saving textfiles in a other folder

It's never a good idea to modify the matlab path (with addpath or others) just to read or write data files.

The simplest way to make sure that a file is read or written in the correct folder is to simply specify the folder as part of the name when you read/write. It's easy to do: use fullfile. You've done exactly that for your dir call. Why didn't you do the same for your fopen calls.

On a completely unrelated subject, matfiles is a fairly good variable name (dircontent may be better), FileName is also a good variable name, it's easy to understand what the variables contains. B is a horrendous variable name. It's also completely pointless in your code, it's unclear why you couldn't just have done

FileName = matfiles(i).name;

and not bother with the B or even better, keep using matfiles(i).name everywhere.

So, in the end:

testfiledir = 'E:\Data\Test\X';  %assuming it's both the input and output directory
matfiles = dir(fullfile(testfiledir, '*.txt'));
for i = 1:numel(matfiles)
Data = fileread(fullfile(testfiledir, matfiles(i).name));
Data = strrep(Data, ',', '.');
FID = fopen(fullfile(testfiledir, matfiles(i).name), 'w');
fwrite(FID, Data);  %no need for char. not sure char is even valid
fclose(FID);

While you could also use readmatrix or readtable as suggested, it may change other formatting of the file and will be slower than the above due to the parsing it does.

MATLAB: How to import multiple files from a folder in MATLAB

Remember to fclose(fid) after you do the fscanf()

The code you show will already only locate file names ending in .txt .

You should be more careful with directories, though:

testfiledir = 'E:\MachineLearning\TestFiles\';
matfiles = dir(fullfile(testfiledir, '*.txt'));
nfiles = length(matfiles);
data  = cell(nfiles);
for i = 1 : nfiles
   fid = fopen( fullfile(testfiledir, matfiles(i).name) );
   data{i} = fscanf(fid,'%c');
   fclose(fid);
end

Best Answer

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