pol_root

class diffsptk.RootsToPolynomial(order)

This is the opposite module to PolynomialToRoots().

Parameters:

orderint >= 1

Order of polynomial.

forward(x, real=False)

Convert roots to polynomial coefficients.

Parameters:

xTensor [shape=(…, M)]

Complex roots.

realbool

If True, return as real numbers.

Returns:

outTensor [shape=(…, M+1)]

Polynomial coefficients.

Examples

>>> x = torch.tensor([3, 4, -1])
>>> pol_root = diffsptk.RootsToPolynomial(x.size(-1))
>>> a = pol_root(x)
>>> a
tensor([ 1, -6,  5, 12])

diffsptk.functional.pol_root(x, real=False)

Compute polynomial coefficients from roots.

Parameters:

xTensor [shape=(…, M)]

Complex roots.

realbool

If True, return as real numbers.

Returns:

outTensor [shape=(…, M+1)]

Polynomial coefficients.

See also

root_pol