Adding new fields to a structure using for loop

Hello everyone,

I have a beginners question on working with structures and for loops: I used the following loop to read csv files into a structure (The ReadResearch function was written by a collegue to read certain csv files from one of our programs):

csvFiles = dir('*.csv'); 
numfiles = length(csvFiles);

for k= 1:numfiles

      data=ReadResearch(csvFiles(k).name); 
      csvFiles(k).name=data;

end

My problem is that if I rerun the skript to read in more files it does not add these files to the structure but overwrites the existing one. can someone explain me what I have to change?

Thank you,

Christoph

[Oleg Komarov]

Just for future reference (you question is clear): http://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer

Answer 1

[Oleg Komarov]

If you already have a csvFiles, the first line should be:

csvFiles = [csvFiles dir('*.csv')];

Before that I would suggest to:

% Calculate offset

offs = numel(csvFiles);

% New loop

for k = offs:lenght(csvFiles)
...
end

Otherwise you will be reading all the files again and not just the new ones.

EDIT

Basically the robustified version reads:

if exist('csvFiles','var') 
    offs     = numel(csvFiles);
    csvFiles = [csvFiles dir('*.csv')]; 
else
    offs     = 0;
end

numfiles = length(csvFiles);
for k = offs+1:numfiles
      data = ReadResearch(csvFiles(k).name); 
      csvFiles(k).name = data;
end

Answer 2

[Christoph Bauer]

thank you that solved it. Kind regards