files managing (copy, move and write)

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kimy 2021-8-4

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编辑： kimy 2021-8-6

surface.zip

Hi,

Now I have a series of files but I don't know how to achieve my goal using Matlab since I am a definitely beginer. I have a folder called surface in which many folders are included, named by a time step (0.1, 0.2 ,0.3 .....). Of course, under each time step folder the data file (e.g. "0.1->patch_ground->scalarfiled->p") that I need is there, as you can recognise in the attchment, which is original data files that I output from an OPENFOAM code I have to write al data included in the file "p" to another file "p" with header under the folder of each timestep ("0.1->p"). By the same procedure, apply for each time step folder with a loop I think. I hope anybody can give me some tips, thanks a lot.

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Answer 1

Simon Chan 2021-8-4

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In your attached file, there is already a file 'p' inside folder '0.1' and I need to remove this file before running the following code. Otherwise, error would occur because copy or move a file onto itself is not allowed.

So please be aware to make sure all file with name 'p' only stored in the subdirectory 'C:\...\patch_ground\scalarField'.

listfolder = dir('**/p');
initial = {listfolder.folder};
destination = cellfun(@(x) strrep(x,'patch_ground\scalarField',''),initial,'UniformOutput',false);
cellfun(@(x,y) copyfile(fullfile(x,'p'),fullfile(y,'p')),initial,destination) 

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Simon Chan 2021-8-4

在 MATLAB Online 中打开

p.txt

Now I understand more about your needs.

The following code execute in the current working directory (myFolder), and the attached folders and files with name 'surface' is located inside the working directory as well.

On the other hand, the file name will change to p.txt (attached) instead of p in this case.

myFolder = 'C:\Users\';                                     % Working directory
destination = 'C:\Users\surface\0.1';                       % Path for the "final p" file
movefile(fullfile(destination,'p'),myFolder);               % Move p file to working folder
listfolder = dir('**/p');                                   % Retrieve all paths having p file
initial = {listfolder.folder};
data = cellfun(@readcell, fullfile(initial,'p'), 'UniformOutput', false);   % Read the information inside p file
alldata = cat(1,data{:});                                   % Combine data from all the p file 
header = readcell('p');                                     % Read the header from the "final p" file
writecell([header;alldata],'p.txt');                        % Write to another file with name p.txt
movefile('p.txt',destination);                              % Put it back to the required directory

kimy 2021-8-5

编辑：kimy 2021-8-5

在 MATLAB Online 中打开

I updated matlab and the script works. Thanks.

In fact the original header file only includes the characters without data. So the script did not work if I removed the data in the header file, indicating an error that the dimension is not consistent.

/*--------------------------------*- C++ -*----------------------------------*\
| =========                 |                                                 |
| \\      /  F ield         | foam-extend: Open Source CFD                    |
|  \\    /   O peration     | Version:     4.1                                |
|   \\  /    A nd           | Web:         http://www.foam-extend.org         |
|    \\/     M anipulation  |                                                 |
\*---------------------------------------------------------------------------*/
FoamFile
{
    version     2.0;
    format      ascii;
    class       scalarAverageField;
    object      values;
}
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
// Average
0
// Data on points

Simon Chan 2021-8-5

在 MATLAB Online 中打开

I try to remove the point data from the file and import it via function readcell, the result has several columns instead of one. This may be the reason why the error occurs.

Try to replace the following line:

header = readcell('header');

with this:

header = readcell('header','Delimiter','\n');

The result shoule be in one column only:

18×1 cell array
    {'/*--------------------------------*- C++ -*----------------------------------*\'}
    {'| =========                 |                                                 |'}
    {'| \\      /  F ield         | foam-extend: Open Source CFD                    |'}
    {'|  \\    /   O peration     | Version:     4.1                                |'}
    {'|   \\  /    A nd           | Web:         http://www.foam-extend.org         |'}
    {'|    \\/     M anipulation  |                                                 |'}
    {'\*---------------------------------------------------------------------------*/'}
    {'FoamFile'                                                                       }
    {'{'                                                                              }
    {'version     2.0;'                                                               }
    {'format      ascii;'                                                             }
    {'class       scalarAverageField;'                                                }
    {'object      values;'                                                            }
    {'}'                                                                              }
    {'// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //'}
    {'// Average'                                                                     }
    {[                                                                              0]}
    {'// Data on points'                                                              }

For any other processing, you can access the variable 'data' which stores all point data from the p file. So you can do whatever you like before combine with the header and write the file.

kimy 2021-8-5

Thanks, it works well. I am thinking that it is better to process the data file before combining header file. But I faild to modify it. I simply tried e.g. "newdata=data-1000".

kimy 2021-8-6

编辑：kimy 2021-8-6

I tried many times and I faild to arange the data inside "p" file. Could you give me some tips? Thanks.

https://it.mathworks.com/matlabcentral/answers/892947-how-to-process-the-data-in-a-series-of-files-under-different-folders?s_tid=srchtitle

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