Loading multiple mat files

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Aftab Ahmed Khan
Aftab Ahmed Khan il 7 Feb 2015
Commentato: Arif Hoq il 20 Dic 2021
Hello everyone, i want to load this 3 set of data files into matlab using for loop but it is not working for me. Any help...............
clear all;
close all;
clc;
datafile={'data1.mat' 'data2.mat' 'data3.mat'};
num_schemes=3;
for sno=1:num_schemes
files = char(data(sno));
load files
end

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Stephen23
Stephen23 il 7 Feb 2015
Modificato: Stephen23 il 16 Mar 2021
You are getting confused between the command syntax and the function syntax. In particular you are trying to use the command syntax with a variable named files, which will never work as the line of code
load files
is interpreted as
load('files')
Where 'files' is treated as a string, not a variable. This is specifically explained in the load documentation: Do not use command form when any of the inputs, such as filename, are variables. The easiest solution is do not use the command syntax in your code, only use the function syntax and then you will never face this problem again. Try this instead:
filenames = {'data1.mat','data2.mat','data3.mat'};
for kk = 1:numel(filenames)
S = load(filenames{kk}) % Best to load into an output variable.
..
end
Also note that I fixed the cell array indexing to use the correct {} braces , removed the char operation which is completely unnecessary as the contents of the cell array filenames are already of class character, and for robustness loaded the file data into an output variable (which is a scalar structure).
  8 Commenti
Stephen23
Stephen23 il 17 Dic 2021
@Mohammad Ariful Hoq: yes, use comma-separated lists:
For example, to get the 'a' variable from all files into one array:
a = [S.a] % or VERTCAT or HORZCAT
Arif Hoq
Arif Hoq il 20 Dic 2021
thank you very much@Stephen

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Più risposte (1)

ELCIO S
ELCIO S il 30 Ott 2018
What about if I have many files with different names? How can I do to load all of them?
  1 Commento
Stephen23
Stephen23 il 30 Ott 2018
Modificato: Stephen23 il 17 Dic 2021
"What about if I have many files with different names? How can I do to load all of them?"
Use DIR or SPRINTF:

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