wK = w0(:);

What does this code mean? wK = w0(:);

wk = w0(:);
y = zeros(N,1);
e = zeros(N,1);
W = wk;
for i = 1:N,
uvi = [u(i+1) u(i)]';
y(i) = wk'*uvi;
e(i) = d(i) - y(i);
w_new = wk + (mu*e(i))*uvi;
wk = w_new;
W = [W wk];

Answer 1

[madhan ravi]

https://in.mathworks.com/help/matlab/ref/colon.html - (:) forces a matrix or a row vector as a column vector

[madhan ravi]

Examples:

>> A

A =

     1     2     3
     4     5     6
     7     8     9

>> A(:)

ans =

     1
     4
     7
     2
     5
     8
     3
     6
     9

>> B = 1:9 

B =

     1     2     3     4     5     6     7     8     9

>> B(:)

ans =

     1
     2
     3
     4
     5
     6
     7
     8
     9

>> 

[Hojin Lim]

Thank you for answering my question.

The reason I ask is that 'wk = w0(:);' gives me an error.

'wk = wk(:);' will work?

[madhan ravi]

First of all you you didn't provide any values to us so your question is vague.

"gives me an error."

Post the complete error message, everything in red.

[Hojin Lim]

>> N = 4096;
Sig1 = 0.27;
Sig2 = 0.1;
randn('state',1);
v1 = randn(N,1);
m = mean(v1);
v1 = v1 - m;
s = sum(v1.^2)/N;
v1 = sqrt(Sig1/s)*v1;
randn('state',7);
v2 = randn(N,1);
m = mean(v2);
v2 = v2 - m;
s = sum(v2.^2)/N;
v2 = sqrt(Sig2/s)*v2;
d = zeros(N+1,1);
x = zeros(N+2,1);
for i = 1:N;
    d(i+1) = -0.8458*d(i) + v1(i);
    x(i+2) = 0.1*x(i+1) + 0.8*x(i) + v1(i);
end
d = d(2:(N+1));
x = x(3:(N+2));
 u = x + v2;
u = [0; u];
>> wk = w0(:);

Undefined function or variable 'w0'.

[madhan ravi]

w0 is not defined!