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refinable Equation Need urgent help

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m_eh_62

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hi
this is a refinable equation
φ(x)=2*∑h(k) φ(2x-k)
I have the h(n) sequence and I want to compute φ(x)
h(k)=[ -0.1294 0.2241 0.8365 0.4830] it is a low pass filter and the φ(x) is scaling function.
the index of this seris is from k=0 to k=N-1
more accurate I need matlab code to solve this equation and give the φ(x) function
How can I do this?
pls help me.
it's very Urgent
 

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