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arraysmatlaboctave
Rick T
Rick T

Reputation: 3389

Splitting array and export values in MATLAB / Octave

I have a large array where the amount of rows will vary, and I would like to split up and export to multiple files.

I was thinking of using the reshape command, but then I realized for this to work the arrays needed to have the same number of rows which will not always be the case.

clear all, clc,clf,tic
num_elm = 11;
num_elm_split = 4;  %Splits into columns
t = linspace(1, num_elm, num_elm)';

v = reshape(t, num_elm_split,[]); %Will split array into different columns
%'for' loop to split number of elements
for ii = 1:length(t(:, 1))
    ii
end

Example:

If I have an array of 11 values

a = [1; 2; 3; 4; 5; 6; 7; 8; 9; 10; 11]

And I want it be split up on every three values and output the data to a file.

ouput1.txt would have in it 1 2 3

ouput2.txt would have in it 4 5 6

ouput3.txt would have in it 7 8 9

ouput4.txt would have in it 10 11

I know I could use the split command in Linux, but I'm trying to use only MATLAB/Octave code.

Upvotes: 0

Views: 858

Answers (2)

Rick T
Rick T

Reputation: 3389

Here's the code...this may help someone else out

clear all, clc,clf,tic
filesoxplaylistStr='1soxplaylist.pls'; %playlistist filename fix
dirplstmp='/tmp/tmp/';

values = 1 : 11;
binSize = 3;
fileNum = 0;
n = numel(values);
for ii = 1 : binSize : n
    part = values(ii : min(n, ii + binSize - 1))';
    fileNum = fileNum + 1
    %open file to write to
    fidsoxpl = fopen(strcat(dirplstmp,filesoxplaylistStr), 'w'); %create and open file to write to for sox playlist join file
    for jj=1:length(part)
        part_val=part(jj,1) %gets individual filename or values

        %create sox file to join
        fprintf(fidsoxpl,'File%s=%s%s.wav',num2str(jj),dirplstmp,num2str(part_val,'%06d'));%create playlist data file
        fprintf(fidsoxpl,'\n');

    end
    % close file to write to
    fclose(fidsoxpl);

    fn=strcat('test',num2str(fileNum,'%02d'));
    %join files with sox
    syscmd=strcat({'sox '},dirplstmp ,filesoxplaylistStr, {' '},dirplstmp,fn,{'.wav'});
    system(syscmd);

    %add freq to file name


end

Upvotes: 0

Florian Brucker
Florian Brucker

Reputation: 10365

The basic idea is to do it like this:

values = 1 : 11;
binSize = 3;
fileNum = 1;
n = numel(values);
for i = 1 : binSize : n
   part = values(i : min(n, i + binSize - 1));
   fprintf('File %d contains %s\n', fileNum, mat2str(part));
   fileNum = fileNum + 1;
end

Output:

File 1 contains [1 2 3]
File 2 contains [4 5 6]
File 3 contains [7 8 9]
File 4 contains [10 11]

You need to adapt the code in the loop to actually save the data on disk, of course.

Upvotes: 2

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