file organisation using copyfile returns unknown error

I'm trying to organise some files but somehow my code makes a folder with the name '\' and moves all the files i meant to move there. it just said unknown error with copy file this time. for context, the file i'm interested is located in /users/.../Daniel/P1 until P20 so i had to use a loop to extract all the dicom files under it. the folder i want to move the dicom files into is the nufolder. in the loop i made a folder for every dicom file name under nufolder, that's where i want to move the files into ( pic included for context )

%change file path here :

mainfolder ='/Users/sm/Downloads/summer project/CL2 Dicom/Daniel';%dicom images

parentfolder = '/Users/sm/Downloads/summer project/';

mkdir nufolder;

parentfolder = '/Users/sm/Downloads/summer project/nufolder';

P_f = dir( fullfile( mainfolder, '*'));

%Plist = setdiff({ P_f([P_f.isdir]).name},{'.','..'}); % works fine up to here

Plist = {P_f([P_f.isdir]).name};

Plist(1:2)=[];

bmp_path = '/Users/sm/Downloads/summer project/input';

I = dir(fullfile(bmp_path,'*.bmp'))

Ilist = {I.name};

%I = dir( fullfile( input, '*'))

%%

for ii = 1: numel(Plist)

P = dir( fullfile( mainfolder,Plist{ii}, '*.dcm'));

dcm = {P(~[P.isdir]).name}; % works great!! gets all the dicom file in the p files

for jj = 1 : numel(dcm)

[filepath, name, ext]= fileparts(dcm(jj)); % converts cell to string

mkdir( parentfolder, name); % makes folders after the dcm names in nufolder

end

for kk = 1 : length(Ilist)

matchedIdx = find( cellfun(@(x) contains(name,x),dcm));

copyfile(fullfile(mainfolder, dcm{jj}), fullfile(parentfolder, '\', Plist{matchedIdx}))

end

result :

Unknown error occurred.

Error in sort_group (line 33)

copyfile(fullfile(mainfolder, dcm{jj}), fullfile(parentfolder, '\', Plist{matchedIdx}))

[Walter Roberson]

Why are you using \ in a path in a Unix system?

[sesilia maidelin]

oh I thought i need it, i'll try removing it. thanks!

[dpb]

fullfile() puts in the proper system-dependent character where it is needed; but it's also smart-enough to remove any extraneous ones so while not kosher I'd expect it to still be a valid filename. But, I can only check what it does on Windoes..

>> parentfolder='X:/root';Plist='file.lst';fullfile(parentfolder, '\', Plist)
ans =
    'X:\root\file.lst'
>> parentfolder='X:/root';Plist='file.lst';fullfile(parentfolder, '/', Plist)
ans =
    'X:\root\file.lst'
>> 

for which either way it is stripped...

[Walter Roberson]

fullfile('abc', '\', 'def')

ans = 'abc/\/def'

fullfile('abc', '/', 'def')

ans = 'abc/def'

so on unix systems, the \ is kept as a literal character.

[dpb]

In that case, it's a bum deal, indeed! :(