Loading multiple data folders and call them in a For Loop

I have 13 data files named data24,data30......to data99

I want to read all the data sets by calling them one for one in a for loop to extract data from each file. By selecting one vector of each file

I have tried some num2str, text2double commands but nothing seems to get it

i have:

data24 = readtable('c4-40-steady_15_pressure24.dat');
data30 = readtable('c4-40-steady_15_pressure30.dat');
data35 = readtable('c4-40-steady_15_pressure35.dat');
data40 = readtable('c4-40-steady_15_pressure40.dat');
data50 = readtable('c4-40-steady_15_pressure50.dat');
data60 = readtable('c4-40-steady_15_pressure60.dat');
data70 = readtable('c4-40-steady_15_pressure70.dat');
data80 = readtable('c4-40-steady_15_pressure80.dat');
data85 = readtable('c4-40-steady_15_pressure85.dat');
data90 = readtable('c4-40-steady_15_pressure90.dat');
data95 = readtable('c4-40-steady_15_pressure95.dat');
data98 = readtable('c4-40-steady_15_pressure98.dat');
data99 = readtable('c4-40-steady_15_pressure99.dat');

Section = [24 30 35 40 50 60 70 80 85 90 95 98 99]; %Sections along blade
for i = Section
 for j = 1:length(Section)
x_pos(j,:) = table2array(data('here is my problem, i want the numbers to be read')(2:62,1)); 
 end
end
 

Answer 1

[Mathieu NOE]

hello

see example below for excel files - simply adapt the inner code to read your data and file extension

also you need to load this excellent FEX submission

https://fr.mathworks.com/matlabcentral/fileexchange/47434-natural-order-filename-sort

clc
clearvars

fileDir = pwd;

S = dir(fullfile(fileDir,'data00*.xlsx')); % get list of data files in directory
S = natsortfiles(S); % sort file names into natural order , see : 
           %(https://fr.mathworks.com/matlabcentral/fileexchange/47434-natural-order-filename-sort)
           
for k = 1:length(S)
    S(k).data = importdata( fullfile(fileDir, S(k).name));
end

[Stephen23]

Note that 'data' was part of the variable names. Matching the filenames requires a file pattern something like

'c4-40-steady_15_pressure*.dat'

Answer 2

[Rik]

Your mistake was in your naming of the variables. If you can guarantee they are always integers, you can do something like this (otherwise you will need ismember with a lookup table):

Section = [24 30 35 40 50 60 70 80 85 90 95 98 99]; %Sections along blade
data=cell(1,max(Section));
for n=1:numel(Section)
    ind=Section(n);
    filename=sprintf('c4-40-steady_15_pressure%d.dat',ind);
    data{ind}readtable(filename);
end

for i = Section
    for j = 1:length(Section)
        x_pos(j,:) = table2array(data{j}(2:62,1)); 
        %                             ^ not sure j is what you need
    end
end

Also, avoid length, use numel or size instead.