derivative

derivative(f, x, step_size=None)

Take the first derivative of a single-variable function by central difference.

Parameters

Name	Type	Description	Default
f	callable	A function taking one number and returning one number.	required
x	float	The point to differentiate at.	required
step_size	float	The finite-difference step. Left unset, or given any value at or below zero, the ported routine’s adaptive step eps**(1/2) * (1 + abs(x)) is used.	None

Returns

Name	Type	Description
	float	The derivative.

Examples

>>> import corehydropy as ch
>>> round(ch.derivative(lambda x: x**3, 2), 6)
12.0