How to load multiple csv files and save them after converting into arff files?

Hello Friends,

I have several csv files, all stored in path 'C:\Users\Name\Documents\MATLAB\*.csv'. I want to loop one by one each file in order, convert them into arff files, and save them 'C:\Users\Name\Documents\MATLAB\*.arff'

Answer 1

[Walter Roberson]

datadir = 'C:\Users\Name\Documents\MATLAB';
d = dir(fullfile(datadir, '*.csv')); 
for i=1:length(d)
  filename = fullfile(datadir, d(i).name);

[Walter Roberson]

I stopped copying at the "%Load csv file." part as it was no important for the point.

It helps if you specify what order you want them in. Perhaps you want http://www.mathworks.com/matlabcentral/fileexchange/47434-natural-order-filename-sort

[Walter Roberson]

If you want to use an output name corresponding to the input name then

outfile = [filename(1:end-2) 'arff'];

[Walter Roberson]

   outfile = [filename(1:end-2) 'arff'];
   saverFile = javaObject('java.io.File', outfile);

[Stephen23]

It would be much more robust to use regexprep rather than indexing and string concatenation, something like this:

>> name = 'MyFile.csv';
>> regexprep(name,'\.csv$','.arff')
ans = 
MyFile.arff

[Walter Roberson]

outfile = [filename(1:end-3) 'arff'];