orthax.orth2poly

orthax.orth2poly(c, rec)Source 

Convert an orthogonal series to a polynomial in standard basis.

Convert an array representing the coefficients of an orthogonal series, ordered from lowest degree to highest, to an array of the coefficients of the equivalent polynomial (relative to the “standard” basis) ordered from lowest to highest degree.

Parameters:

c (array_like) – 1-D array containing the orthogonal series coefficients, ordered from lowest order term to highest.
rec (AbstractRecurrenceRelation) – Recurrence relation for the family of orthogonal polynomials.

Returns:

pol (ndarray) – 1-D array containing the coefficients of the equivalent polynomial (relative to the “standard” basis) ordered from lowest order term to highest.