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nonlinear filter?

From: Francesco Potorti`
Subject: nonlinear filter?
Date: Sat, 24 Feb 2007 11:01:37 +0100

I want to solve for Q in an expression like:
 Q(i) = Q(i-1) + I(i) - Q(i)
 U(i) = f(Q(i-1), I(i-1))

Given a vector I, I can find Q using filter() if f() is linear.  Is
there a way to solve this problem when f is not linear using Octave
other than looping through all elements of Q?

Francesco Potortì (ricercatore)        Voice: +39 050 315 3058 (op.2111)
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