Extracting specific data from multiple excel files and create a single matrix from those

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Hi, I have a file on my computer with close to 1000 excel files and I don't want to manually extract the second row from every excel file manually and combine into a single excel file.
I was wondering how I can do this on Matlab through reading every Excel file in that specific file and taking out all of the columns from the second rows and then combining all that into a single matrix?
Thanks for the help

Accepted Answer

Mathieu NOE
Mathieu NOE on 31 Aug 2021
hello
this is one example if you want to work out the entire folder
I assumed it would be numeric data so I used importdata (faster)
I also sorted the files names in natural order in case it might be relevant
It works even if your files have different size (number of columns)
clc
clearvars
fileDir = cd;
outfile = 'OUT.xlsx'; % output file name
fileNames = dir(fullfile(cd,'*.xlsx')); % get list of all excel files in directory
fileNames_sorted = natsortfiles({fileNames.name}); % sort file names into order
M= length (fileNames_sorted);
for f = 1:M
% option # 1 for numeric data only using importdata
raw = importdata( fullfile(fileDir, fileNames_sorted{f}));
second_row{f} = raw(2,:); % extract the second row
end
% write all second row lines into a matrix and store it in excel file
writecell(second_row',fullfile(cd,outfile));
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More Answers (1)

Ive J
Ive J on 31 Aug 2021
Edited: Ive J on 31 Aug 2021
You can use readmatrix (assuming all values are numeric, otherwise use readtable) or fileDatastore to read those files. Something like this should work:
myfiles = ["file1.xlsx", "file2.xlsx"]; % file names: use dir to generate file names within the target directory
data = [];
for i = 1:numel(myfiles)
tab = readmatrix(myfiles(i)); % see readmatrix for more options
data = [data; tab(2, :)]; % aggregate 2nd row from all files into a new matrix
end
  13 Comments
Jonas Freiheit
Jonas Freiheit on 1 Sep 2021
Sorry, the error was that it was printing out only 401 and 0. The problem has been solved now I really appreciate the help.

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