read data from files in a loop and append into one array

Hi,I have a number of files, each contains 2columns but varies number of rows.

I set up a loop to read the data from each of them. Now, I want to put the read-out-data append to an array (so at the end the array will have n-rows x 2-columns). how can I do that please? below I have listed the code I have for reading the data. Many thanks.

filenum = 2;

for i=1:filenum  
    f = load(['output_' num2str(i) '.txt']) %load the datafiles:
                                            %output_1.txt, output_2.txt,...etc
     %here, want to add all the 'f' here into an array
end

example: file1

11 22
33 44

file2

22 33
55 66
77 88

array want:(if call it NewArray)

NewArray = 
11 22
33 44
22 33
55 66
77 88

Answer 1

[Azzi Abdelmalek]

filenum = 2;
M=[];
for ii=1:filenum
  name=sprintf('output%d_%dstd.txt',ii,stdtimes)
  M=[M;dlmread(name)]
   %here, want to add all the 'f' here into an array
end

[smo]

hi, thanks for your reply. Sorry when i wrote my codes up there I forgot to adjust it a bit and I have changed it now.

the 'f = load(['output_' num2str(i) '.txt'])' is that I want to read the datafiles output_1.txt, output_2.txt.... etc (that I have 50 of these data files).

could you please have a look at it again because I am still getting an empty array 'M' with your code. I don't know if it's because I didnt explain myself well enough earlier.

Thanks :)

[Azzi Abdelmalek]

filenum = 2;
M=[];
for ii=1:filenum
  name=sprintf('output_%d.txt',ii)
  M=[M;dlmread(name)]
end

[smo]

thank you very much.

Answer 2

[Image Analyst]

See the FAQ: http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F