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From: Diana Saleh on 23 Jun 2008 06:30
Hi,

i know this problem have been discussed before, but i still
cant figure out my problem base on previous discussion. I
have this simple function:

function [yq] = hipassq (x,N,w,x_1,y_1)
% Writing different equations for the transfer function H(z)
= 1/(z+o.5).
% This MATLAB function here is for the quantized different
equations.
% x : input sequence
% y : output sequence
% N : number of output values
% w : word length (bit)
% initialising
q = 2^(-w+1);
x_1q = q*round(x_1/q);
y_1q = q*round(y_1/q);
a_1q = q*round(0.5/q);
y_1q = x_1q - 0.5*y_1q;
y(1) = q*round(y_1q/q);
for n = 2:N
yq(n) = x(n-1) - a_1q*y(n-1);
end

As I run this program in MATLAB, this error occured:

??? Attempted to access y(2); index out of bounds because
numel(y)=1.

Error in ==> hipassq at 16
yq(n) = x(n-1) - 0.5*y(n-1);

Can anyone help me please? Thank you =)
From: us on 23 Jun 2008 06:37
"Diana Saleh":
<SNIP down to possible typo...

> for n = 2:N
> yq(n) = x(n-1) - a_1q*y(n-1);
> end

should probably(!) read

y(n) = x(n-1) - a_1q*y(n-1);

us
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