wK = w0(:);

2019 3 26
1 个回答
更新时间：2019 3 26
3 次查看（30 天）

0 个投票

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];

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回答（1 个）

madhan ravi
madhan ravi 2019-3-26

0 个投票

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

5 个评论
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madhan ravi
madhan ravi 2019-3-26
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
Hojin Lim 2019-3-26
Thank you for answering my question.
The reason I ask is that 'wk = w0(:);' gives me an error.
'wk = wk(:);' will work?
madhan ravi
madhan ravi 2019-3-26
编辑：madhan ravi 2019-3-26
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
Hojin Lim 2019-3-26
编辑：madhan ravi 2019-3-26
>> 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
madhan ravi 2019-3-26
w0 is not defined!

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