B-Spline Fitting Method (CURVE)
Returns a B-spline or a user-written curve created by a CURVE data element.
Format
CURVE (Independent Variable, Derivative Order, Direction, Curve Name)
Arguments
Independent Variable | Real variable that represents the independent variable at which the curve will be evaluated (function). If the curve is a B-spline, the Independent Variable must be in the range: - 1  Independent Variable 1. If the curve is user-written (computed by a CURSUB), the Independent Variable must be in the range: Min_Parameter Independent Variable Max_Parameter where Min_Parameter and Max_Parameter are specified on the CURVE data element. |
Derivative Order | Order of the derivative that you want returned from the curve. The legal values are: ■0 - returns the curve coordinate value ■1 - returns the first derivative ■2 - returns the second derivative |
Direction | Direction in which you want the curve evaluated. The legal values are: ■1 - returns the x coordinate or derivative ■2 - returns the y coordinate or derivative ■3 - returns the z coordinate or derivative |
Curve Name | Name of the curve to reference (curve object). |
Example
The following function returns the x direction evaluated value of curve_1 at point TIME, where TIME is the current simulation time:
CURVE(TIME, 0, 1, curve_1)