- PchipInterpolator.derivatives(x, der=None)¶
Evaluate many derivatives of the polynomial at the point x
Produce an array of all derivative values at the point x.
x : array-like
Point or points at which to evaluate the derivatives
der : None or integer
How many derivatives to extract; None for all potentially nonzero derivatives (that is a number equal to the number of points). This number includes the function value as 0th derivative.
d : ndarray
Array with derivatives; d[j] contains the j-th derivative. Shape of d[j] is determined by replacing the interpolation axis in the original array with the shape of x.
>>> KroghInterpolator([0,0,0],[1,2,3]).derivatives(0) array([1.0,2.0,3.0]) >>> KroghInterpolator([0,0,0],[1,2,3]).derivatives([0,0]) array([[1.0,1.0], [2.0,2.0], [3.0,3.0]])