read files from 1 dic

Hi, i want to read various files from 1 past

but i have this error:

Instead its type was struct.

Error in interp (line 47)

validateattributes(idata,{'single','double'},{'vector'},'interp','x');

Error in Untitled_interpolar (line 33)

ecg_new = interp(ecg,5);

clear, close 
clc

path_dados_originais = "C:\Users\35191\OneDrive - Universidade de Aveiro\Emotional transition - recognition\Dados_Sessoes\S1.mat";
path_dados_interpolados = "C:\Users\35191\OneDrive - Universidade de Aveiro\Emotional transition - recognition\Dados_Sessoes\S1_interpolados";

cd(path_dados_originais)

Error using cd
Unable to change current folder to '/users/mss.system.uICeX0/C:\Users\35191\OneDrive - Universidade de Aveiro\Emotional transition - recognition\Dados_Sessoes\S1.mat' (Name is nonexistent or not a folder).

%Ficheiros a usar:
allfiles = dir;
Nfiles = size(allfiles(3:end,1),1);


% Transformação de .txt para .mat 

% for idx = 1:length(allfiles)
%     file_name = allfiles(idx).name;
% 
%     fprintf("Processing File %s\n",file_name);
%     data = importdata(file_name);
%     [filepath,name,ext] = fileparts(fullfile(pwd,file_name));
%    save([name '.mat'],'data');
% end

for j=1:Nfiles
    
    cd(path_dados_originais)
    %Ler os dados
    file = allfiles(j+2).name;

    eval(['load ' file ])
    ecg = data(:,1);

    ecg_new = interp(ecg,5);

    cd(path_dados_interpolados)
    mat_dados = [ecg_new]; 

    eval(['save' file(1:end-4) ' mat_dados'])
end

[Rik]

Why are you using this fragile code design with eval? Also, none of the code indicates what could be the source of the problem, so you will have to attach one of your mat files and explain what you want to happen.