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invchebcoefs(vector(b0,b1,...,bn)), b0, b1, ... non MISSING REAL

Keywords: expansions, power series
Suppose Pn(x) = b0+b1*T1(x)+...+bn*Tn(x), where Tj(x) is the Chebyshev
polynomial of degree j, defined as Tj(x) = cos(j*acos(x)) for -1 <= x
<= 1.  Then Pn(x) is a polynomial and can be expressed as Pn(x) =
a0+a1*x+ ... + an*x^n.

invchebcoefs(vector(b0,b1,...,bn)), where b0, ..., bn are non MISSING
real scalars, returns vector(a0,a1,...,an), the coefficients of the
powers of x of Pn(x).

See also topic chebcoefs().

Gary Oehlert 2003-01-15