derivative

swordfish.function.derivative()

Return the derivative of func of order n at X.

参数:

• func (Constant) -- A unary function.

• X (Constant) -- A numeric scalar/vector indicating where the derivative is evaluated.

• dx (Constant, optional) -- A scalar of FLOAT type indicating spacing. The default value is 1.0.

• n (Constant, optional) -- An integer scalar indicating the order of the derivative. As of now only n=1 is supported.

• order (Constant, optional) -- An integer scalar indicating the number of points to use. It must be an odd number. The default value is 3 and can be values between 3 and 1023.