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//
// GENERATED FILE
//
use super::*;
use crate::SpiceContext;
use f2rust_std::*;
/// Unit vector and norm, general dimension
///
/// Normalize a double precision vector of arbitrary dimension and
/// return its magnitude.
///
/// # Brief I/O
///
/// ```text
/// VARIABLE I/O DESCRIPTION
/// -------- --- --------------------------------------------------
/// V1 I Vector to be normalized.
/// NDIM I Dimension of V1 (and also VOUT).
/// VOUT O Unit vector V1 / ||V1||.
/// VMAG O Magnitude of V1, i.e. ||V1||.
/// ```
///
/// # Detailed Input
///
/// ```text
/// V1 is an arbitrary double precision n-dimensional vector,
/// including the zero vector.
///
/// NDIM is the dimension of V1 and VOUT.
/// ```
///
/// # Detailed Output
///
/// ```text
/// VOUT is the double precision n-dimensional unit vector in the
/// direction of V1. If V1 is the zero vector, then VOUT
/// will also be the zero vector.
///
/// VMAG is the magnitude of V1.
/// ```
///
/// # Exceptions
///
/// ```text
/// Error free.
/// ```
///
/// # Particulars
///
/// ```text
/// UNORMG references a function called VNORMG (which itself is
/// numerically stable) to calculate the norm of the input vector V1.
/// If the norm is equal to zero, then each component of the output
/// vector VOUT is set to zero. Otherwise, VOUT is calculated by
/// dividing V1 by the norm. No error detection or correction is
/// implemented.
/// ```
///
/// # Examples
///
/// ```text
/// The numerical results shown for this example may differ across
/// platforms. The results depend on the SPICE kernels used as
/// input, the compiler and supporting libraries, and the machine
/// specific arithmetic implementation.
///
/// 1) Define a set of n-dimensional vectors and compute their
/// corresponding unit vectors and magnitudes.
///
///
/// Example code begins here.
///
///
/// PROGRAM UNORMG_EX1
/// IMPLICIT NONE
///
/// C
/// C Local parameters.
/// C
/// INTEGER NDIM
/// PARAMETER ( NDIM = 4 )
///
/// INTEGER SETSIZ
/// PARAMETER ( SETSIZ = 2 )
///
/// C
/// C Local variables.
/// C
/// DOUBLE PRECISION VMAG
/// DOUBLE PRECISION V1 ( NDIM, SETSIZ )
/// DOUBLE PRECISION VOUT ( NDIM )
///
/// INTEGER I
/// INTEGER J
///
/// C
/// C Define the vector set.
/// C
/// DATA V1 /
/// . 5.D0, 12.D0, 0.D0, 4.D0,
/// . 1.D-6, 2.D-6, 2.D-6, 0.D0 /
///
/// C
/// C Calculate the unit vectors and magnitudes.
/// C
/// DO I=1, SETSIZ
///
/// CALL UNORMG ( V1(1,I), NDIM, VOUT, VMAG )
///
/// WRITE(*,'(A,4F12.7)') 'Vector :',
/// . ( V1(J,I), J=1,NDIM )
/// WRITE(*,'(A,4F12.7)') 'Unit vector:', VOUT
/// WRITE(*,'(A,F12.7)') 'Magnitude :', VMAG
/// WRITE(*,*)
///
/// END DO
///
/// END
///
///
/// When this program was executed on a Mac/Intel/gfortran/64-bit
/// platform, the output was:
///
///
/// Vector : 5.0000000 12.0000000 0.0000000 4.0000000
/// Unit vector: 0.3676073 0.8822575 0.0000000 0.2940858
/// Magnitude : 13.6014705
///
/// Vector : 0.0000010 0.0000020 0.0000020 0.0000000
/// Unit vector: 0.3333333 0.6666667 0.6666667 0.0000000
/// Magnitude : 0.0000030
/// ```
///
/// # Restrictions
///
/// ```text
/// 1) No error checking is implemented in this subroutine to guard
/// against numeric overflow.
/// ```
///
/// # Author and Institution
///
/// ```text
/// N.J. Bachman (JPL)
/// J. Diaz del Rio (ODC Space)
/// W.M. Owen (JPL)
/// W.L. Taber (JPL)
/// ```
///
/// # Version
///
/// ```text
/// - SPICELIB Version 1.1.0, 05-JUL-2021 (JDR)
///
/// Added IMPLICIT NONE statement.
///
/// Edited the header to comply with NAIF standard. Removed
/// unnecessary $Revisions section. Updated code comments.
///
/// Added complete code example based on existing example.
///
/// - SPICELIB Version 1.0.2, 23-APR-2010 (NJB)
///
/// Header correction: assertions that the output
/// can overwrite the input have been removed.
///
/// - SPICELIB Version 1.0.1, 10-MAR-1992 (WLT)
///
/// Comment section for permuted index source lines was added
/// following the header.
///
/// - SPICELIB Version 1.0.0, 31-JAN-1990 (WMO)
/// ```
pub fn unormg(v1: &[f64], ndim: i32, vout: &mut [f64], vmag: &mut f64) {
UNORMG(v1, ndim, vout, vmag);
}
//$Procedure UNORMG ( Unit vector and norm, general dimension )
pub fn UNORMG(V1: &[f64], NDIM: i32, VOUT: &mut [f64], VMAG: &mut f64) {
let V1 = DummyArray::new(V1, 1..=NDIM);
let mut VOUT = DummyArrayMut::new(VOUT, 1..=NDIM);
//
// SPICELIB functions
//
//
// Local variables
//
//
// Obtain the magnitude of V1
//
*VMAG = VNORMG(V1.as_slice(), NDIM);
//
// If VMAG is nonzero, then normalize. Note that this process is
// numerically stable: overflow could only happen if VMAG were small,
// but this could only happen if each component of V1 were also small.
// In fact, the magnitude of any vector is never less than the
// magnitude of any component.
//
if (*VMAG > 0.0) {
for I in 1..=NDIM {
VOUT[I] = (V1[I] / *VMAG);
}
} else {
for I in 1..=NDIM {
VOUT[I] = 0.0;
}
}
//
}