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how to read previous data

Asked by Nurulhuda Ismail on 22 May 2019
Latest activity Commented on by Nurulhuda Ismail on 23 May 2019
Hi,
Assume that I have to use 'for loop' iterations, i = 1: n and I want to calculate a function called 'alpha' as shown below.
My problem is, how I am going to write the MATLAB code for this function especially how to extract the last 2 previous value of alpha (alpha_{i-2}?

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1 Answer

Answer by Raj
on 23 May 2019
 Accepted Answer

Define alpha in an array and use the previous two elements by suitable indexing in a 'for' loop. Something like this:
n=input('Enter value of n:');
alpha=zeros(n+1,1); % Initialize alpha. Since index cannot start from zero,start from 1 upto n+1 rows
alpha(1,1)=1;
alpha(2,1)=2;
d=rand(n-1,1); % Use your d here
b=rand(n-1,1); % Use your b here
for ii=3:n+1
alpha(ii,1)=(d(ii-2,1)*alpha(ii-1,1))-(b(ii-2,1)*alpha(ii-1,1)*alpha(ii-2,1));
end
Hope this helps!!

  1 Comment

It works. Thank you very much Raj.

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