GTCURV

Use

The function can be called by any user-defined subroutine.

Format

Fortran Calling Syntax

CALL GTCURV (id, alpha, iord, array, istat)

C/C++ Calling Syntax

c_gtcurv(id, alpha, iord, array, istat)

Python Calling Syntax

[array, istat] = py_gtcrv(id, alpha, iord)

MATLAB Calling Syntax

[array, istat] = m_gtcrv(id, alpha, iord)

Attributes

ID

[integer]

The identifier of the corresponding Reference_ParamCurve.

ALPHA

[double precision]

The independent parameter alpha at which the curve is to be evaluated. For B-splines, alpha must satisfy -1 <= alpha <= 1.

For curves defined using CURSUB, alpha must satisfy MINPAR <= alpha <= MAXPAR.

IORD

[integer]

The variable that specifies the order of the derivative returned by GTCURV as follows:

Iord

Meaning

0

Returns the curve coordinate.

1

Returns the first derivative with respect to alpha.

2

Returns the second derivative with respect to alpha.

Output

ARRAY

[double precision]

The array of three elements as shown below:

Iord	Array First Element	Array Second Element	Array Third Element
0	$\text{x}$	$\text{y}$	$\text{z}$
1
2

All elements are evaluated at alpha.

ISTAT

[integer]

Variable that indicates the success or the reason for the failure of GTCURV.