Thread Subject: looping dlmwrite with changing filename

I'm trying to subdivide a number of large matrices into 35 smaller ones, and saving them as separate ASCII files. So first, I loop over the 150 large matrices, and then I want to loop over the 35 subdivision within each matrix.

I've got this up to now, loading the big matrices:

for k = 1:150(pats)
  baseFileName = pats(k).name;
  fullFileName = fullfile(fol, baseFileName);
  load fullFileName;
  matrix=MNE_raw.data; %this is the actual matrix
  matrix=double(matrix);

I'm stuck trying to loop over the subdivision and saving. Every submatrix needs to be 4096x142 (the large matrix is 466000x142), and would ideally be saved as an ASCII file with the original name in pats, with an addition for each of the 35 subdivisions. I can only think of doing it manually:

  e1=matrix(1:4096,1:142);
  e2=matrix(4097:8193,1:142);
  e3=matrix(8193:12288,1:142);
  e4=matrix(12289:16384,1:142);
  .....

and then saving manually as well:

 save('origname_e1.txt','e1','-ascii','-tabs');
 ....

And so on. Is there a way to do this using loops?

Thanks!
  
  


 

"Linda" wrote in message <jh15bd$fj2$1@newscl01ah.mathworks.com>...
> I'm trying to subdivide a number of large matrices into 35 smaller ones, and saving them as separate ASCII files. So first, I loop over the 150 large matrices, and then I want to loop over the 35 subdivision within each matrix.
>
> I've got this up to now, loading the big matrices:
>
> for k = 1:150(pats)
> baseFileName = pats(k).name;
> fullFileName = fullfile(fol, baseFileName);
> load fullFileName;
> matrix=MNE_raw.data; %this is the actual matrix
> matrix=double(matrix);
>
> I'm stuck trying to loop over the subdivision and saving. Every submatrix needs to be 4096x142 (the large matrix is 466000x142), and would ideally be saved as an ASCII file with the original name in pats, with an addition for each of the 35 subdivisions. I can only think of doing it manually:
>
> e1=matrix(1:4096,1:142);
> e2=matrix(4097:8193,1:142);
I think this should be:
     e2=matrix(4097:8192,1:142);

> e3=matrix(8193:12288,1:142);
> e4=matrix(12289:16384,1:142);
> .....
>
> and then saving manually as well:
>
> save('origname_e1.txt','e1','-ascii','-tabs');
> ....
>
> And so on. Is there a way to do this using loops?

I don't have MATLAB on this computer,
but you might try something like this:

nmax = 466000/4096 % or use something like size(1) in place of 466000
% Are you sure about the 466000?

% This asssumes you don't need to access the "e's" within you code:
for n = 1:nmax
   e=matrix((1 + (n-1)*4096):(n*4096),1:142);
   save(['origname_e' num2str(n) '.txt'],'e','-ascii','-tabs');
end

% If you do, then use something like":
for n = 1:nmax
   e=matrix((1 + (n-1)*4096):(n*4096),1:142);
   save(['origname_e' num2str(n) '.txt'],'e','-ascii','-tabs');
   e{n} = e;
end



>
> Thanks!
>
>
>
>
>

"someone" wrote in message <jh19vk$2d6$1@newscl01ah.mathworks.com>...
> "Linda" wrote in message <jh15bd$fj2$1@newscl01ah.mathworks.com>...
> > I'm trying to subdivide a number of large matrices into 35 smaller ones, and saving them as separate ASCII files. So first, I loop over the 150 large matrices, and then I want to loop over the 35 subdivision within each matrix.
> >
> > I've got this up to now, loading the big matrices:
> >
> > for k = 1:150(pats)
> > baseFileName = pats(k).name;
> > fullFileName = fullfile(fol, baseFileName);
> > load fullFileName;
> > matrix=MNE_raw.data; %this is the actual matrix
> > matrix=double(matrix);
> >
> > I'm stuck trying to loop over the subdivision and saving. Every submatrix needs to be 4096x142 (the large matrix is 466000x142), and would ideally be saved as an ASCII file with the original name in pats, with an addition for each of the 35 subdivisions. I can only think of doing it manually:
> >
> > e1=matrix(1:4096,1:142);
> > e2=matrix(4097:8193,1:142);
> I think this should be:
> e2=matrix(4097:8192,1:142);
>
> > e3=matrix(8193:12288,1:142);
> > e4=matrix(12289:16384,1:142);
> > .....
> >
> > and then saving manually as well:
> >
> > save('origname_e1.txt','e1','-ascii','-tabs');
> > ....
> >
> > And so on. Is there a way to do this using loops?
>
> I don't have MATLAB on this computer,
> but you might try something like this:
>
> nmax = 466000/4096 % or use something like size(1) in place of 466000
> % Are you sure about the 466000?
>
> % This asssumes you don't need to access the "e's" within you code:
> for n = 1:nmax
> e=matrix((1 + (n-1)*4096):(n*4096),1:142);
> save(['origname_e' num2str(n) '.txt'],'e','-ascii','-tabs');
> end
>
> % If you do, then use something like":
> for n = 1:nmax
> e=matrix((1 + (n-1)*4096):(n*4096),1:142);
> save(['origname_e' num2str(n) '.txt'],'e','-ascii','-tabs');
> e{n} = e;
> end

Thanks so much for this solution. I don't need the e's, so I used the first solution, and it works for the most part.
One problem remains, which I probably wasn't clear on. I would like the 'origname' to take the baseFileName defined before, but I only get files called baseFileName_e1.txt etc. How can I fix this?

"Linda" wrote in message <jh1o3b$hp9$1@newscl01ah.mathworks.com>...
> "someone" wrote in message <jh19vk$2d6$1@newscl01ah.mathworks.com>...
> > "Linda" wrote in message <jh15bd$fj2$1@newscl01ah.mathworks.com>...
> > > I'm trying to subdivide a number of large matrices into 35 smaller ones, and saving them as separate ASCII files. So first, I loop over the 150 large matrices, and then I want to loop over the 35 subdivision within each matrix.
> > >
> > > I've got this up to now, loading the big matrices:
> > >
> > > for k = 1:150(pats)
> > > baseFileName = pats(k).name;
> > > fullFileName = fullfile(fol, baseFileName);
> > > load fullFileName;
> > > matrix=MNE_raw.data; %this is the actual matrix
> > > matrix=double(matrix);
> > >
> > > I'm stuck trying to loop over the subdivision and saving. Every submatrix needs to be 4096x142 (the large matrix is 466000x142), and would ideally be saved as an ASCII file with the original name in pats, with an addition for each of the 35 subdivisions. I can only think of doing it manually:
> > >
> > > e1=matrix(1:4096,1:142);
> > > e2=matrix(4097:8193,1:142);
> > I think this should be:
> > e2=matrix(4097:8192,1:142);
> >
> > > e3=matrix(8193:12288,1:142);
> > > e4=matrix(12289:16384,1:142);
> > > .....
> > >
> > > and then saving manually as well:
> > >
> > > save('origname_e1.txt','e1','-ascii','-tabs');
> > > ....
> > >
> > > And so on. Is there a way to do this using loops?
> >
> > I don't have MATLAB on this computer,
> > but you might try something like this:
> >
> > nmax = 466000/4096 % or use something like size(1) in place of 466000
> > % Are you sure about the 466000?
> >
> > % This asssumes you don't need to access the "e's" within you code:
> > for n = 1:nmax
> > e=matrix((1 + (n-1)*4096):(n*4096),1:142);
> > save(['origname_e' num2str(n) '.txt'],'e','-ascii','-tabs');
> > end
> >
> > % If you do, then use something like":
> > for n = 1:nmax
> > e=matrix((1 + (n-1)*4096):(n*4096),1:142);
> > save(['origname_e' num2str(n) '.txt'],'e','-ascii','-tabs');
> > e{n} = e;
> > end
>
> Thanks so much for this solution. I don't need the e's, so I used the first solution, and it works for the most part.
> One problem remains, which I probably wasn't clear on. I would like the 'origname' to take the baseFileName defined before, but I only get files called baseFileName_e1.txt etc. How can I fix this?

You should be able to replace:

save(['origname_e' num2str(n) '.txt'],'e','-ascii','-tabs');

with:

save([baseFileName '_e' num2str(n) '.txt'],'e','-ascii','-tabs');

Fantastic, thanks!