Help with creating a function which is dependent on the array previous values

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Abdelrhman Abdelfatah
评论： Abdelrhman Abdelfatah 2022-12-8
Hello,
I need to create a first order or a second order Predictar and the user get to decide which order he wants. And the predictator is basically a new utlaized array of the main one but with its values dependent on the previous values ( first order depends on only 1 previous value, while 2nd order depends on 2 previous values and so on)
Here is how I did the first order Predictaror
%% x_k is my message signal
x_kdelay = [0 x_k(1:end-1)]; %Delay by 1 unit
d_k = x_k - x_kdelay;
But then I wanted to add the second order and here is what I did, but it's giving me an error.
x_kdelay = [0 x_k(1:end-1)]; %Delay by 1 unit
%%%%% Predictator (New global state)
if p == 1
d_k = x_k - x_kdelay;
elseif p == 2
for i5= 1: numel(x_k)
d_k(i5) = x_k(i5) - (x_kdelay(i)+x_kdelay(i-1))
end
end
Then Later on I want to re-do this step at the receiver side, here is the function I created for the first order Predictator re-do.
intial = 0;
x_hat = [];
for i3 = 1:numel(d_k)
x_ind = intial +dq_tx(i3);
x_hat = [x_hat x_ind];
intial = x_ind;
end
And I would apprechiate any help in modifying it to support the second order case as well.
Thank you
  2 个评论
Dyuman Joshi
Dyuman Joshi 2022-12-7
In the if-else segment, the loop index is incorrect or the variable i is not defined .
If it is i5, and since i5 starts with 1, then i5-1 == 0 will give you an error when used as an index.
if p == 1
d_k = x_k - x_kdelay;
elseif p == 2
for i5= 1: numel(x_k)
d_k(i5) = x_k(i5) - (x_kdelay(i)+x_kdelay(i-1))
%^ %^
end
end
For the 2nd code snippet, x_hat is same as cumsum(dq_tx(1:numel(d_k)) and initial is equalto last value of x_hat.

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