Subroutine Type

Utility/Data Access

Definition

Uses the quintic (fifth order) spline fitting method to return the interpolated value or n-th derivative of the interpolated value for a Reference_Spline element.

Use

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

Calling Syntax

Fortran

CALL QUISPL (XVAL, ZVAL, ID, IORD, ARRAY, ERRFLG)

C

c_quispl (xval, zval, id, iord, array, errflg)

Python

[array, errflg] = py_quispl (xval, zval, id, iord)

MATLAB

[array, errflg] = m_quispl (xval, zval, id, iord)

Input Arguments

[double] XVAL

The X value at which the QUISPL spline function is supposed to interpolate the output value.

[double] ZVAL

The Z value at which the QUISPL spline function is supposed to interpolate the output value

[integer] ID

The ID of the Reference_Spline element

[integer] IORD

The order of the derivative to be returned by the QUISPL function

Output Values

[double] ARRAY

The vector output value of dimension 3.

If IORD is 0, then ARRAY(1) contains the computed interpolated value y.

If IORD is 1, then ARRAY(1) and ARRAY(2) contain the derivatives of y with respect to x and z.

If IORD is 2, then ARRAY(1), ARRAY(2) and ARRAY(3) contain the second derivatives of y with respect to xx, xz, and zz, respectively.

[logical] ERRFLG

Logical variable that is returned to the calling subroutine and that indicates the success of the QUISPL function call.