Call: DERIVATIVE
A 1-dimensional array of ordinates.
This array must be strictly in increasing order.
This array must have the same length as y.
A 1-dimensional array of function values.
This array must have the same length as x.
A number, the value of x at which y'(x) is to be computed.
On return, a number approximately equal to y'(x)
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 0103-05-16 at 14:05.