I want to divide p(x) by q(x) given that:
p(x)=-5x^4+3x^2-6x
q(x)=x^2+1
I tried:
p=inline( -5*(x^4)+3*(x^2) , x )
p =
Inline function:
p(x) = -5*(x^4)+3*(x^2)
q=inline( x^2+1 , x )
q =
Inline function:
q(x) = x^2+1
deconv(p,q)
but got error:
??? Undefined function or method filter for input arguments of type inline .
Error in ==> deconv at 32
[q,zf] = filter(b, a, [1 zeros(1,nb-na)]);
WHY?
Inline functions are just matlab expressions that it will evaluate. It has no idea whether they are polynomials or not.
You want this:
p = [-5 0 3 -6 0];
q = [2 0 1];
[quotient remainder] = deconv(p, q)
No need for Symbolic Math Toolbox here.
r = sym(p) sym(q) would do the trick. The result would be a symbolic function, of course. To convert that to inline, s = inline(r).
Edit: As for the "WHY": you cannot divide two inline functions. Instead, they must first be converted to their symbolic representation.
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