how can I stop this error?

this is code of my equation getting from you.

Z = zeros(size(W1)); kernel = [Z, W1, Z; W3, Z, W4; Z, W2, Z]; filtered = conv2(vk, kernel, 'same'); vk = (1-w)*vk + filtered./W(i,j);

my equation

v(i,j))^(k+1)=  (1-ω)(v(i,j))^(k)-ω[(W1(i,j)(v(i+1,j))^(k)+  W2(i,j)(v(i-1,j))^(k+1)+ W3(i,j)(v(i,j+1)^(k)+ W4(i,j)(v(i,j-1))^(k+1)(/(W i,j)]

v matrix
k iteration
W  matrix 
w constant

the error I have is!.

Undefined function or variable "vk".

Error in ==> SOR at 69 filtered = conv2(vk, kernel, 'same');

[Matt Kindig]

Exactly what the error is saying: you haven't defined "vk" prior to this line:

filtered = conv2(vk, kernel, 'same');

[Mary Jon]

Undefined function or variable "vk".

Error in ==> SOR at 69 filtered = conv2(vk, kernel, 'same');

[Walter Roberson]

Yes. You have not set "vk" to anything by the time that line is executed. You do not assign anything to "vk" until the next expression.

[Mary Jon]

Sorry ,but what I do to 'vk'? how make it defined ?

[Image Analyst]

vk is presumably your original signal. If you don't know what it is, then what do you think you're filtering? Why are you attempting to filter something but don't know what it is? If you're running a filter, you must have some idea of what you want to filter, otherwise, why bother?

Answer 1

[Walter Roberson]

Initialize with k = 0 and vk = your original signal.

[Mary Jon]

I know 'vk' my original initial condition ,I defined 'v' as a matrix n*m

[Walter Roberson]

Initialize vk = v.