MATLAB Central Newsreader - matrix

matrix

Handan Yaslan — Wed, 04 Nov 2009 13:40:04 -0500

Hi
I obtained the matrix A using a lot of calcultation in the for,
for i=1:N
    for j=1:N
        for k=1:N
          (I did a lot of calcultation ,so I obtained the matrix A )
                A
      end
   end
end

Main problem;
for every each step I want to see A matrix. For example
i=1 j=1,k=1 what is A?
i=1,j=1,k=2, A=?
i=N j=N k=N A=?

I tried B(i,j,k)=A,but matlab gives error....
How can I seperate A matrix for each step?

thanks.....

Re: matrix

Steven Lord — Wed, 04 Nov 2009 14:13:13 -0500

"Handan Yaslan" <hyaslan.nospam@mathworks.com> wrote in message
news:hcs07k$kd7$1@fred.mathworks.com...
> Hi
> I obtained the matrix A using a lot of calcultation in the for,
> for i=1:N
> for j=1:N
> for k=1:N
> (I did a lot of calcultation ,so I obtained the matrix A )
> A
> end
> end
> end
>
> Main problem;
> for every each step I want to see A matrix. For example
> i=1 j=1,k=1 what is A?
> i=1,j=1,k=2, A=?
> i=N j=N k=N A=?
>
> I tried B(i,j,k)=A,but matlab gives error....
> How can I seperate A matrix for each step?

The easiest way to do this is probably with a cell array:

C = cell(N,N,N);
% start the FOR loops
% obtain A
C{i, j, k} = A;
% end the FOR loops

C{2,3,4} % is A for i = 2, j = 3, k = 4.

--
Steve Lord
slord@mathworks.com
comp.soft-sys.matlab (CSSM) FAQ: http://matlabwiki.mathworks.com/MATLAB_FAQ

Re: matrix

Sebastiaan — Wed, 04 Nov 2009 14:13:02 -0500

Hi!

I think your matrix has a different size for each (i,j,k), so you can use a cell array:
B{i,j,k} = A

(note the {} in stead of () ).

Sebastiaan

"Handan Yaslan" <hyaslan.nospam@mathworks.com> wrote in message <hcs07k$kd7$1@fred.mathworks.com>...
> Hi
> I obtained the matrix A using a lot of calcultation in the for,
> for i=1:N
> for j=1:N
> for k=1:N
> (I did a lot of calcultation ,so I obtained the matrix A )
> A
> end
> end
> end
>
> Main problem;
> for every each step I want to see A matrix. For example
> i=1 j=1,k=1 what is A?
> i=1,j=1,k=2, A=?
> i=N j=N k=N A=?
>
> I tried B(i,j,k)=A,but matlab gives error....
> How can I seperate A matrix for each step?
>
> thanks.....

Re: matrix

Handan Yaslan — Wed, 04 Nov 2009 14:43:03 -0500

"Handan Yaslan" <hyaslan.nospam@mathworks.com> wrote in message <hcs07k$kd7$1@fred.mathworks.com>...
> Hi
> I obtained the matrix A using a lot of calcultation in the for,
> for i=1:N
> for j=1:N
> for k=1:N
> (I did a lot of calcultation ,so I obtained the matrix A )
> A
> end
> end
> end
>
> Main problem;
> for every each step I want to see A matrix. For example
> i=1 j=1,k=1 what is A?
> i=1,j=1,k=2, A=?
> i=N j=N k=N A=?
>
> I tried B(i,j,k)=A,but matlab gives error....
> How can I seperate A matrix for each step?
>
> thanks.....

thank you very much for your answers....
But now I have other problem. In my problem
for i=-N:N
for j=-N:N
for k=-N:N

C{i,j,k} is used for positive integer . I will try to solve this case...If you have some information would you write to me....

Re: matrix

Matt Fig — Wed, 04 Nov 2009 16:40:18 -0500

One way to do something like this is to mimic manually the integer loop indices.

cnt_ii = 1;
cnt_jj = 1;

for ii = -.5:.1:.5
    for jj = -.9:.1:.9
        G{cnt_ii,cnt_jj} = rand;
        cnt_jj = cnt_jj + 1;
    end
    cnt_ii = cnt_ii + 1;
    cnt_jj = 1;
end