Loading multiple data folders and call them in a For Loop

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Jeroen van Bemmel
Jeroen van Bemmel 2021-11-19
评论： Stephen23 2021-11-19
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

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回答（2 个）

Mathieu NOE
Mathieu NOE 2021-11-19
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
  1 个评论
Stephen23
Stephen23 2021-11-19
Note that 'data' was part of the variable names. Matching the filenames requires a file pattern something like
'c4-40-steady_15_pressure*.dat'

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Rik
Rik 2021-11-19
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.

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