Error using load Unable to read file No such file or directory.

Hi,

I want to run my code but I confront Error using load Unable to read file 'E:\Program Files\MATLAB\R2016a\bin\EegMyDataDir 1\with occular artifact\cnt' No such file or directory

part of the code is below:

Thanks for help!

clc
clear all
warning off all
close all

%% Parameters
K = 0;
Task_time = 10;
subjects_num = 29;
channel_num = 30;
low_cut_off = 1;
high_cut_off = 45;
filter_order = 4;

%% reading and processing
for subj = setdiff(1:subjects_num,21)    
    load(['E:\Program Files\MATLAB\R2016a\bin\EegMyDataDir ',num2str(subj),'\with occular artifact\cnt'])
    load(['E:\Program Files\MATLAB\R2016a\bin\EegMyDataDir ',num2str(subj),'\with occular artifact\mrk'])
    

[Jan]

Never, never, never store data or user-defined functions inside Matlab installation folder, e.g. E:\Program Files\MATLAB\R2016a\bin. The effects are not predictable.

Answer 1

[Guillaume]

The error message is very clear, there is no file E:\Program Files\MATLAB\R2016a\bin\EegMyDataDir 1\with occular artifact\cnt

If you intended for that file to exist, then you need to find out why it doesn't. It's nothing to do with matlab.

On the other hand, you should never use any directory in Program Files to store your data. That's a sure way of corrupting your software installation. So I'd recommend you use another directory such as My Documents\Matlab to store you files.

Also, since you don't appear to be very experience with matlab, I would strongly recommend not using warning off all.

[mr de]

Dear Guillaume,

Thanks for reply,I change the path like the below code but I have the same error

my .mat files are exist at the path

clc
clear all
warning off all
close all

%% Parameters
K = 0;
Task_time = 10;
subjects_num = 29;
channel_num = 30;
low_cut_off = 1;
high_cut_off = 45;
filter_order = 4;

%% reading and processing
for subj = setdiff(1:subjects_num,21)    
    load(['C:\Users\Hamid\EEGBerlin\EEG\eeg data\subject ',num2str(subj),'\with occular artifact\cnt'])
    load(['C:\Users\Hamid\EEGBerlin\EEG\eeg data\subject ',num2str(subj),'\with occular artifact\mrk'])

[Fabiana]

Please, did you find a soluction? Because I am in the exact situation... I can't run the scrip bacause I can't load the path... And I have no experience with MatLab...

[Stephen23]

"I can't run the scrip bacause I can't load the path"

Paths cannot be loaded anyway, only .MAT files can be LOADed.

[Fabiana]

Thanks, @Stephen23. Maybe my doubt should be "how can I informe where are the files that must be read"?

Because I received a script from a colegue:

%%%%%% Analyse des fichiers Alcool

filename = [C:Users\Donnes\G' cell2mat(GROUPE(groupe)) '_S' num2str(suj) '_' cell2mat(SESSION(session)) '.mat'];

datalcool = load(filename);

disp(['Traitement Physio en cours du Sujet ' num2str(suj) '(' cell2mat(GROUPE(groupe)) ' ans) en session alcool ' cell2mat(SESSION(session)) ])

% Voies des données physiologiques : données brutes

EDAraw.valeur = datalcool.mat(:,1);

ECGraw.valeur = datalcool.mat(:,2);

EEG1raw.valeur = datalcool.mat(:,3);

EEG2raw.valeur = datalcool.mat(:,4);

datalcool.mat(:,6:9)=[];

time = (0:1/Fe:(length(datalcool.mat(:,1))-1)/Fe);

delt1 = diff(datalcool.mat(:,5));

deltpos1 = find (delt1>0);

deltatime = time(deltpos1(1));

When I supprime the firt part in the braquetes (i.e.C:Users\Donnes\), the error is in variable G'. When I isert ['G' G' cell2mat(GROUPE(groupe)) '_S' num2str(suj) '_' cell2mat(SESSION(session)) '.mat'] the error in "filename" persist... And I am bloqued in the firt line of the script!

[Stephen23]

@Fabiana: yes, that code is not written to be easily modified nor easily understood. Replace the first two lines with this:

P = 'C:\Users\username\MATLAB'; % define the path here
F = 'nameofyourfile.mat';       % define the name here, use SPRINTF if required
datalcool = load(fullfile(P,F));

Answer 2

[pankhuri kasliwal]

Check if your file is in the current folder

dir your_file_name.mat

Sometimes the path problem can happen, in that case use this,

addpath(fullfile('your_path'));

[mr de]

Dear pankhuri,

Thanks for answer but I tried both way that you suggested but again had same error

[Guillaume]

Data directories do not need and should not be added to the matlab path.

[Pablo Israel Morales Guzmán]

@Guillaume why not? How does then Matlab find data? Giving the full path each time?

[Stephen23]

@Pablo Israel Morales Guzmán: the MATLAB search path is for MATLAB code files.

Adding locations with lots of data files:

• confuses the paradigms of data and code,
• slows down MATLAB (because it has to actively scan more folders and files for changes),
• makes your code behavior practically non-deterministic (consider duplicate filenames),
• makes debugging harder (ditto).

"How does then Matlab find data? Giving the full path each time?"

MATLAB should not "find" data files (how do you know that it will find the correct data?), instead you should simply and reliably tell it exactly what data files to access. Absolute or relative filenames are accepted by all functions that access data files.

Exactly as @Guillaume wrote: Data directories do not need and should not be added to the matlab path.

[Fabiana]

I can't understand the difference between "added to the matlab path" (because the orientation is Data directories do not need and should not be added to the matlab path.) and "tell it exactly what data files to access" (because the orientation is instead you should simply and reliably tell it exactly what data files to access. Absolute or relative filenames are accepted by all functions that access data files)

[Stephen23]

@Fabiana: it is very simple:

• the MATLAB Search Path is for code. Putting lots of data folders and data files on the Search Path makes MATLAB slow and debugging your code harder.
• MATLAB functions that import/export data from files accept absolute/relative filenames. Using absolute/relative filenames is efficient and robust. Use FULLFILE if required, e.g.:

P = 'C:\Users\MyName\someFolder'; % absolute or relative filepath
F = 'DataFile.csv';               % filename
T = readtable(fullfile(P,F));

https://www.mathworks.com/help/matlab/matlab_env/specify-file-names.html

See also:

https://www.mathworks.com/matlabcentral/answers/228557-experts-of-matlab-how-did-you-learn-any-advice-for-beginner-intermediate-users

Answer 3

[Simenew]

clc

clear all

warning off all

close all

% load the absorption spectra

load('absorption_with_plasmon.txt'); % Load the Absorption spectrum with plasmonic effects

load('absorption_without_plasmon.txt'); % Load the Absorption spectrum without plasmonic effects

% Wavelength range

lambda = linspace(350, 700, 50); % Wavelength range in nm

% Interpolate the absorption spectra to match the desired wavelength range

absorption_with_plasmon_interp = interp1(wavelength, absorption_with_plasmon, lambda);

absorption_without_plasmon_interp = interp1(wavelength, absorption_without_plasmon, lambda);

% Calculate the intrinsic absorption enhancement

AE = absorption_with_plasmon_interp ./ absorption_without_plasmon_interp;

% Plot the intrinsic absorption enhancement

figure;

plot(lambda, AE, 'b-', 'LineWidth', 2);

xlabel('Wavelength (nm)');

ylabel('Intrinsic Absorption Enhancement (AE)');

title('Intrinsic Absorption Enhancement in P3HT:PCBM');

grid on;

Abs_enhancement

Error using load

Unable to find file or directory 'absorption_with_plasmon.txt'.

Error in Abs_enhancement (line 2)

load('absorption_with_plasmon.txt'); % Load the Absorption spectrum with plasmonic

[Simenew]

How can I fixing it?

[Stephen23]

"How can I fixing it?"

https://www.mathworks.com/help/matlab/matlab_prog/debugging-process-and-features.html