Working with a three dimensional matrix

I have a matrix with three dimensions, and I need to take two dimensions through the use of cycle FOR.

For example:

 Name variable       Value
     k             <39x17x60>

And I need this:

a = 60;
for i = 1:60;
  l = k...;    %size of l <39x17> 
  xlswrite...;
end

Answer 1

[Oleg Komarov]

The problem is how you construct kunn, in general there are so many nested loops that my suspect is you end up overwriting the data, go in debug mode and see what happens each time you increase the frist loop and so on:

function[F0mean,F0max,F0min,F0max_min,F0std,F0median,relF0VR,relF0SD,...
         Emean,Emax,Emin,Emax_min,Estd,Emedian,TEO,Jmean,...
         Jmax,Jmin,Jmax_min,Jstd,Jmedian,Smean,Smax,Smin,...
         Smax_min,Sstd,Smedian,F1mean,F1max,F1min,F1max_min,F1std,...
         F1median,F2mean,F2max,F2min,F2max_min,F2std,F2median]...
         = HRA()

[wav,lab]=databaze;

wav = wav';
lab = lab';

L = length(wav);

for j = 2:L+1
    brd = process_lab_file(lab{j-1});
    label = brd(:,1);
    K = length(label);
    for i = 1:K
        [F0mean,F0max,F0min,F0max_min,F0std,F0median,relF0VR,relF0SD,...
         Emean,Emax, Emin,Emax_min, Estd, Emedian, TEO,...
         Jmean,Jmax,Jmin,Jmax_min,Jstd,Jmedian,...
         Smean,Smax,Smin,Smax_min,Sstd,Smedian,...
         F1mean,F1max,F1min,F1max_min,F1std,F1median,...
         F2mean,F2max,F2min,F2max_min,F2std,F2median]=extr_part_of_sig(wav{j-1},label(i),lab{j-1});

          priznaky =...
              [F0mean,F0max,F0min,F0max_min,F0std,F0median,relF0VR,relF0SD,...
               Emean,Emax, Emin,Emax_min, Estd, Emedian, TEO,...
               Jmean,Jmax,Jmin,Jmax_min,Jstd,Jmedian,...
               Smean,Smax,Smin,Smax_min,Sstd,Smedian,...
               F1mean,F1max,F1min,F1max_min,F1std,F1median,...
               F2mean,F2max,F2min,F2max_min,F2std,F2median];
          O = length(priznaky);
          for o = 1:O
              zap(o,i) = priznaky(o);
          end
      end
      F = length(priznaky);
      for i = 1:K
          for a = 1:F
              kunn(a,j-1,i) = zap(a); 
          end
      end
  end
S = length(label);
jaj = zeros(39,17);
for f = 1:S
    jaj = kunn(:,:,2); 
    koj = jaj';
    %xlswrite('ZK.xls', koj, label{i}, 'B2');
end

[Pepa]

In debug I found error. You have right. Matrix in kunn is same...

Answer 2

[Kenneth Eaton]

If you're asking how you would index k in your loop to get a 2-D submatrix, you would do the following:

l = k(:,:,i);

[Paulo Silva]

I wasn't fast enough, you posted first :)

% k <39x17x60>

k=randn(39,17,60); %example data

%And I need this:

l=zeros(39,17); %preallocation of l

for i = 1:60

l=k(:,:,i); %size of l <39x17>

%xlswrite...;

end

[Pepa]

In your case it works, but in my case it doesn't work, but i don't know why.

S = length(label);

jaj = zeros(39,17);

for f = 1:S

jaj = kunn(:,:,f);

koj = jaj';

%xlswrite('ZK.xls', koj, label{i}, 'B2');

end

[Paulo Silva]

please explain exactly what doesn't work in your simple code?

[Pepa]

I don't know where is the problem. But it does't work how i expected.

If i changed code:

jaj = kunn(:,:,2); (or diferent number it does't matter and in variable jaj is first matrix (39x17))

Screenshot of variables:

http://img153.imageshack.us/i/89568725.gif/

http://img829.imageshack.us/i/72979235.gif/

[Kenneth Eaton]

Pepa, I'm still not clear on exactly what error/problem you are having when you run your code. The two screenshots of the variables look fine. Note that kunn(:,:,1) and jaj are the same, there is just a scaling factor of 1.0e+003 used to display kunn.

[Pepa]

My problem is that if i put in kunn(:,:,X) X = 1,2,...n, In jaj is still kunn(:,:,1).

[Walter Roberson]

By the way, preallocation of jaj is not needed as you are overwritten its complete contents each trip through the loop.

[Walter Roberson]

Pepa, put in kunn(:,:,X) *where* ?? Code example, please.

[Pepa]

Whole code of function:

function [F0mean,F0max,F0min,F0max_min,F0std,F0median,relF0VR,relF0SD,...

Emean,Emax, Emin,Emax_min, Estd, Emedian, TEO,...

Jmean,Jmax,Jmin,Jmax_min,Jstd,Jmedian,...

Smean,Smax,Smin,Smax_min,Sstd,Smedian,...

F1mean,F1max,F1min,F1max_min,F1std,F1median,...

F2mean,F2max,F2min,F2max_min,F2std,F2median] = HRA ()

[wav,lab]=databaze;

wav = wav';

lab = lab';

L = length(wav);

for j = 2:L+1

brd = process_lab_file(lab{j-1});

label = brd(:,1);

K = length(label);

for i = 1:K

[F0mean,F0max,F0min,F0max_min,F0std,F0median,relF0VR,relF0SD,...

Emean,Emax, Emin,Emax_min, Estd, Emedian, TEO,...

Jmean,Jmax,Jmin,Jmax_min,Jstd,Jmedian,...

Smean,Smax,Smin,Smax_min,Sstd,Smedian,...

F1mean,F1max,F1min,F1max_min,F1std,F1median,...

F2mean,F2max,F2min,F2max_min,F2std,F2median]=extr_part_of_sig(wav{j-1},label(i),lab{j-1});

priznaky = [F0mean,F0max,F0min,F0max_min,F0std,F0median,relF0VR,relF0SD,...

Emean,Emax, Emin,Emax_min, Estd, Emedian, TEO,...

Jmean,Jmax,Jmin,Jmax_min,Jstd,Jmedian,...

Smean,Smax,Smin,Smax_min,Sstd,Smedian,...

F1mean,F1max,F1min,F1max_min,F1std,F1median,...

F2mean,F2max,F2min,F2max_min,F2std,F2median];

O = length(priznaky);

for o = 1:O

zap(o,i) = priznaky(o);

end

end

F = length(priznaky);

for i = 1:K

for a = 1:F

kunn(a,j-1,i) = zap(a);

end

end

end

S = length(label);

jaj = zeros(39,17);

for f = 1:S

jaj = kunn(:,:,2); % PROBLEM IS HERE

koj = jaj';

%xlswrite('ZK.xls', koj, label{i}, 'B2');

end

[Oleg Komarov]

Why don't you apply what Kenneth suggested (not to mention Walter):

jaj = kunn(:,:,s)

And what's the problem, btw, can you elaborate, post any error message or unwanted result?

[Pepa]

It does't work, I applied this jaj=kunn(:,:,s).I don't know why. No error, just in the jaj is still only first matrix.

[Pepa]

I can use every number on position 's' and result is always same and this is first matrix...

[Oleg Komarov]

isequal(kunn(:,:,1),kunn(:,:,2)) should be 0, can you confirm?

[Pepa]

No i can't. isequal(kunn(:,:,1),kunn(:,:,2)) result is logical 1. And this is my problem.