I need to load multiple files and extract one value from each file into an output file

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Adriana Amrhein
Adriana Amrhein 2021-10-6
回答： Prateek Rai 2021-10-9
I have 300 files containing 8000 columns and 16 rows. I need to read in each file and extract the value from column 1300 row 14. I want to extract all these values into one output file. Can anyone help? Thanks!
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Voss
Voss 2021-10-6
Then you should be able to use load to read the files:
% fn is assumed to be a cell array containing your 300 file names (full paths)
data = zeros(1,300);
for i = 1:300
new_data = load(fn{i});
data(i) = new_data(14,3000);
end
And then fopen, fprintf, etc., to write your output file.

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回答（1 个）

Prateek Rai
Prateek Rai 2021-10-9
To my understanding, you have 300 text files containing 8000 columns and 16 rows and you want to read data of column 1300 row 14 from each file.
% input to tabularTextDatastore will be the location of the folder where you have your text files
dts = tabularTextDatastore('Location of the folder containing text files');
files = dts.Files;
% data will store the data of column 1300 row 16 from each text files
data = zeros(300,1);
% for loop to read the data from every text files
for i = 1:1:length(files)
file_i = load(files{i});
data(i) = file_i(14,1300);
end
You can refer to tabularTextDatastore MathWorks Documentation page to learn more on datastore for tabular text files.

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