Performing operations using variables created by For Loop outputs

Using a previous For Loop, I have created 704 3x3 matrices defined as N1uik, N2uik, N3uik...N704uik. (All values contained are real numbers)

I now want to use elements of these matrices as part of another For Loop, to create various other matrices named x1,x2,x3...x704.

I have tried:

For n=13:692
  x(1,1)=((N(n-11)uik(1,3))-(N(n+11)uik(1,3)))/2;
  x(1,2)=((N(n-1)uik(1,3))-(N(n+1)uik(1,3)))/3;
  x(1,3)=0
  eval(sprintf('x%d=x',n));
end

Obviously recalling values from the previously defined variables in this "N(n+1)uik" way does not work. How can this be done?

Thanks

Answer 1

[Azzi Abdelmalek]

This is incorrect expression

N(n-11)uik(1,3)

Why have you created all those variables, while you could use one array 704x3x3?

[Craig]

Yes so for example when n=13, using this how would I recall the 1st row, 3rd column value of "N2uik"? (eg (n-11) when in format Nnuik)

[Azzi Abdelmalek]

If A is your 704x3x3 array

%N2uik is A(2,:,:)
out=A(2,1,3)

You don't need all those variables

[Matt J]

It was a mistake to create individual variables named N1uik, N2uik, N3uik...N704uik.

You should have made a 3x3x704 array named Nuik with each slice Nuik(:,:,n) containing the thing you now call Nnuik. Go back and fix that.

It will be a further mistake to create individual variables named x1,x2,x3...x704. Store them instead as x(1), x(2),...x(704).

[Craig]

Okay thank you both very much for your help,

I have gone back and gathered the 3x3 arrays into one 3x3x704. This not only works but makes things much neater also.

How can I store the outputs as x(1) instead of x1?

eval(sprintf('x(%d)=x',n));

Is incorrect.

Thanks again

[Matt J]

 x=zeros(length(13:692),3);

 for n=13:692

    i=n-12;

    x(i,1)=( Nuik(1,3,n-11) - Nuik(1,3,n+11)  )/2;
    x(i,2)=( Nuik(1,3,n-1) - Nuik(1,3,n+1)  )/3;;

 end