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Call: DERIVATIVE


x

A 1-dimensional array of ordinates.

This array must be strictly in increasing order. This array must have the same length as y.


y

A 1-dimensional array of function values.

This array must have the same length as x.


x_int

A number, the value of x at which y'(x) is to be computed.

dy

On return, a number approximately equal to y'(x)

option

A character string that can contain the following keywords:

Keyword Meaning Notes
LINEAR Linear interpolation Rarely useful
PARABOLIC Quadratic interpolation Default
CUBIC Cubic interpolation Risk of oscilation


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Formatted on 0100-08-24 at 22:37.