CODEWITHSUNDEEP
matlabloopscsv
user2587726
user2587726

Reputation: 338

Matlab looping over files not combining csv's

Apologies this is similar to "Loop through files in a folder in matlab" where I've gotten some of the code but I have encountered a problem with this code.

I have many csv files I need to loop over and combine in to one long csv/matrix to analyse, and so I am using the code 

files = dir('*.csv'); % Get all input files

for file=files' % loop over files
    csv = csvread(file.name); %get data points
    signal = csv(:,2);
end

The problem I've found is that this only seems to take data from the first file. As in, if:
file1 = [1 2 3]; file2 = [4 5 6];

I get signal = 1 2 3, not 1 2 3 4 5 6.

So, it's as if the loop isn't moving on from the first file, but I thought a for loop was forced to move on, hence my confusion.

TIA

Upvotes: 0

Views: 62

Answers (2)

Wolfie
Wolfie

Reputation: 30047

You just need to loop through the files struct

files = dir('*.csv'); % Get all input files
N = numel( files );
signal = cell( N, 1 ); % preallocate output

for ifile = 1:N % loop over files
    csv = csvread( file(ifile).name ); % get data points
    signal{ifile} = csv(:,2);          % store output
end

Then you might combine all the results if you want to operate on them as one

signal = vertcat( signal{:} );

Upvotes: 2

user2587726
user2587726

Reputation: 338

I got there in the end

files = dir('*.csv'); % Get all input files
L = length(files);

csv = csvread(files(1).name);
signal = csv(:,2);

for i = 2:L
   csv = csvread(files(i).name);
   %Did stuff with code
end

Upvotes: 0

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