polynomial_eval
polynomial_eval(coefficients, x, variant='standard', n=None)Evaluate a polynomial.
Mirrors the C# Evaluate class’s three polynomial evaluators (Horner’s method), vectorized over x against one shared coefficients array: variant="standard" calls Evaluate.Polynomial (coefficients in ASCENDING order, coefficients[0] the constant term); "reverse" calls Evaluate.PolynomialRev (coefficients in DESCENDING order, coefficients[0] the highest-order term), optionally truncated to order n + 1 via n; "reverse_unit" calls Evaluate.PolynomialRev_1 (DESCENDING order with an implicit leading coefficient of 1).
Parameters
| Name | Type | Description | Default |
|---|---|---|---|
| coefficients | array_like | Polynomial coefficients. | required |
| x | array_like | Points at which to evaluate. | required |
| variant | ('standard', 'reverse', 'reverse_unit') | "standard" |
|
| n | int | Redefines the polynomial’s order to n + 1. Only valid with variant="reverse". |
None |
Returns
| Name | Type | Description |
|---|---|---|
| numpy.ndarray |
Examples
>>> from corehydropy import polynomial_eval
>>> polynomial_eval([3, 5, 7], 4)
array([135.])
>>> polynomial_eval([3, 5, 7], 4, variant="reverse")
array([75.])
>>> polynomial_eval([3, 5, 7], 4, variant="reverse", n=1)
array([17.])