Index exceeds the number of array elements (0).

clc
clear all
close all

myDir = 'C:\Users\bpeoples\Downloads\SCANSNAPCODE_BDP\Numerical Comparison\Diffused Above, SV600 Raised\1st 25'; %call out folder contained in image
ext_img = '*.jpg';              %file extension of interest
a = dir([myDir ext_img]); %array of all files in folder with .jpg ext
nfile = max(size(a)) ; %file count

%read all images into a single struct
for i=1:nfile
   my_img(i).img = imread([myDir a(i).name]);
end

Keep getting the error: Index exceeds the number of array elements (0).

[dpb]

Have you used the debugger and checked what the file name is that you actually passed to dir()?

Hint: The solution could make use of fullfile()

Answer 1

[Guillaume]

Yes, you will receive this error whenever your dir doesn't find any file. Three things:

• Use meaningful variable names, dircontent is a lot better variable name than a.
• don't build paths by string concatenation. Use fullfile instead:

dircontent = dir(fullfile(myDir, ext_img);

• Never use max(size(vector)) to get the number of elements in a vector. When dir doesn't find any file, it returns a 0x1 vector. max of 0 and 1 is 1, even though the vector has 0 elements. Always use numel to get the number of elements. It's faster, shorter and always works.

So:

myDir = 'C:\Users\bpeoples\Downloads\SCANSNAPCODE_BDP\Numerical Comparison\Diffused Above, SV600 Raised\1st 25'; %call out folder contained in image
ext_img = '*.jpg';              %file extension of interest
dircontent = dir(fullfile(myDir, ext_img));
assert(numel(dircontent) > 0, 'No file was found. Check that the path is correct');
my_img = struct('img', cell(size(dircontent)));  %preallocation of the structure
for fileidx = 1:numel(dircontent)
    my_img(fileidx).img = imread(fullfile(myDir, dircontent(fileidx).name));
end

Of course, you still need to fix the initial problem which is that dir didn't find any file. Most likely, you've made a mistake with your path.

[dpb]

"dir didn't find any file. Most likely, you've made a mistake with your path."

He didn't add the delimiter before catenating the filename wildcard string...so as you also note fullfile will help.

[Ammar Adnan]

% In this program, we want to find the centre and aim point of each element

% on the coil surface

clc;

clear;

tic

data=xlsread('focus.csv');

index =find(isnan(data(:,1))==1);

l=length(data);

nodes =data(1:index(1)-1,2:4);

faces =data(index(2)+1:l,1:4) +1;

% Finding the indices of triangular (it) and quadrilateral (iq) elements

it=find(isnan(faces(:,4))==1); t=length(it);

iq=find(isnan(faces(:,4))==0); q=length(iq);

Index exceeds the number of array elements (0).

Error in stinput_focus (line 9)

nodes =data(1:index(1)-1,2:4);

what's the error ?

Answer 2

[Enguerrand Galmiche]

This Code :

%Ce programme sert à analyser les fonctions de corrélations en fonction du
%RMSD de différents complexes protéines - ligand 
experience='Analyse_Corr_RMSD_Prot_Lig';
extension='csv';

%Récupération des données dans le dossier de l'expérience 
File_Corr_Data=dir(fullfile('C:\Users\Stagiaire\Desktop\Enguerrand\Prot_Lig_Neu_MoProCommandLine', ['*.',extension]));
filelist=dir(fullfile('C:\Users\Stagiaire\Desktop\Enguerrand\Analyse_Pose_Docking\Données_Brutes', ['*.',extension]));
Correlations_P1xP2_P1xP3_data = csvread('C:\Users\Stagiaire\Desktop\Enguerrand\Prot_Lig_Neu_MoProCommandLine\Analyse_Corr_data.csv');
nfiles=length(filelist);
disp(filelist)

for ifile=1:nfiles
    disp(['Traitement du fichier n° ',sprintf('%d',ifile)])
    filename = fullfile('C:\Users\Stagiaire\Desktop\Enguerrand\Analyse_Pose_Docking\Données_Brutes',filelist(ifile).name); % Récupération du nom de fichier complet
    disp(filename)
    %Initialisation des vecteurs
    RMSD=[];
    Glide_Score=[];
    Correlations_P1xP2_P1xP3=[];
    for i=1:length(filename)
        RMSD_data = csvread(filename, 1, 1);
        RMSD = RMSD(:,1);
        Glide_Score_data = csvread(filename, 1, 2);
        Glide_Score = RMSD(:,2);
        Correlations_P1xP2_P1xP_3_data=csvread(Correlations_P1xP2_P1xP3_data,0,0);
        Correlations_P1xP2_P1xP3=Correlations_P1xP2_P1xP3(i,1);
        disp (RMSD)
        disp (Glide_Score)
        disp (Correlations_P1xP2_P1xP3)
    end
end

%Calcul du produit de corrélation par le glide_score 
Prod_Corr_Score = Correlations_P1xP2_P1xP3*Glide_Score;

%Initialisations 
Double_RMSD = zeros(nfiles,1);
Int_RMSD = zeros(nfiles,1); 
Count_RMSD = zeros(nfiles,1);

Double_RMSD = 2*RMSD;
Int_RMSD = fix(Double_RMSD);


for j=1:nfiles
    Count_RMSD = unique(Int_RMSD);
end    
    
%Calcul de la fréquence de chaque valeur de RMSD
X_max = max(Prod_Corr_Score); %Cherche la valeur de RMSD la plus grande dans la matrice Eff_RMSD
Eff_Corr = hist(Prod_Corr_Score,X_max); %build input vector
Freq_Corr = Eff_Corr/length(Int_RMSD); % histogramme normalisé
Freq_Corr_Percent = 100*Freq_Corr;
Cumul_Corr =  cumsum(Freq_Corr_Percent);
figure
bar(Cumul_Corr);
figure
axis on
plot(Cumul_Corr,'Color','r','LineStyle','-','Marker','^','MarkerFaceColor','r','MarkerSize',5)
title('Evolution du pourcentage de poses de docking en fonction du RMSD')
xlabel('$2 \times RMSD (\AA)$', 'Interpreter', 'LaTeX')
ylabel('% Poses trouvées')

Return the error : Error in Analyse_Corr_RMSD_Prot_Lig (line 22)

RMSD_data = csvread(filename, 1, 1);

[Enguerrand Galmiche]

What is possible for solve this problem ?