How to Convert 2D matrix to 3D with time as 3rd dimension

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Venkata Jayadeep Kodali
I have a code which results in a 2D matrix .The code is in a loop . So I get many 2D matrix values. I want to convert it into a 3D matrix with 3rd Dimension as time. How can I do this ?

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回答（2 个）

Azzi Abdelmalek
Azzi Abdelmalek 2013-6-13
A(:,:,k)=B
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Evan
Evan 2013-6-13
Do you mean you want B to be the time? If so, yes, tic/toc would work. You would call tic outside the loop then have something like this inside:
A(:,:,k) = toc;
Azzi Abdelmalek
Azzi Abdelmalek 2013-6-13
You can also use a struct format
for k=1:5
A=rand(4); % for example
data(k).time=k % for example
data(k).matrix=A
end

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Youssef Khmou
Youssef Khmou 2013-6-13
hi,
You can the method provided above, but the function "toc" may have problems , i propose using an integer variable , here is an example :
% Eeach time we get a 2D AWGN matrix with different Standard Deviation
N=100;
L=200;
for n=1:N
r=rand;
M(:,:,n)=r*randn(L);
end
If your loop indexes start differently( negative values per example , try this solution :
N=100;
L=200;
time=1;
for n=-10:N
r=rand;
M(:,:,time)=r*randn(L);
time=time+1;
end

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