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//
// GENERATED FILE
//
use super::*;
use crate::SpiceContext;
use f2rust_std::*;
/// Vector distance
///
/// Return the distance between two three-dimensional vectors.
///
/// # Brief I/O
///
/// ```text
/// VARIABLE I/O DESCRIPTION
/// -------- --- --------------------------------------------------
///
/// V1,
/// V2 I Two 3-vectors.
///
/// The function returns the distance between V1 and V2.
/// ```
///
/// # Detailed Input
///
/// ```text
/// V1,
/// V2 are two vectors in three-dimensional space, the
/// distance between which is desired.
/// ```
///
/// # Detailed Output
///
/// ```text
/// The function returns the distance between V1 and V2. This is
/// defined as
///
/// || V1 - V2 ||,
///
/// where || x || indicates the Euclidean norm of the vector x.
/// ```
///
/// # Exceptions
///
/// ```text
/// Error free.
/// ```
///
/// # Particulars
///
/// ```text
/// This function is simply shorthand for the code
///
/// CALL VSUB ( V1, V2, DIFF )
///
/// DIST = VNORM ( DIFF )
///
/// Using this function saves you the annoyance of declaring local
/// storage for the difference vector DIFF.
///
///
/// The Euclidean norm of a three-dimensional vector (x, y, z) is
/// defined as
///
/// 1/2
/// 2 2 2
/// ( x + y + z ).
///
///
/// This number is the distance of the point (x, y, z) from the
/// origin. If A and B are two vectors whose components are
///
/// ( A(1), A(2), A(3) ) and ( B(1), B(2), B(3) ),
///
/// then the distance between A and B is the norm of the difference
/// A - B, which has components
///
///
/// ( A(1) - B(1), A(2) - B(2), A(3) - B(3) ).
///
///
/// A related routine is VDISTG, which computes the distance between
/// two vectors of general dimension.
/// ```
///
/// # Examples
///
/// ```text
/// 1) If V1 is
///
/// ( 2.0D0, 3.0D0, 0.D0 )
///
/// and V2 is
///
/// ( 5.0D0, 7.0D0, 12.D0 ),
///
/// VDIST (V1, V2) will be 13.D0.
///
///
/// 2) If VGR2 and NEP are states of the Voyager 2 spacecraft and
/// Neptune with respect to some common center at a given time
/// ET, then
///
/// VDIST ( VGR2, NEP )
///
/// yields the distance between the spacecraft and Neptune at time
/// ET.
/// ```
///
/// # Author and Institution
///
/// ```text
/// N.J. Bachman (JPL)
/// J. Diaz del Rio (ODC Space)
/// W.L. Taber (JPL)
/// ```
///
/// # Version
///
/// ```text
/// - SPICELIB Version 1.1.0, 25-MAY-2021 (JDR)
///
/// Added IMPLICIT NONE statement.
///
/// Edited the header to comply with NAIF standard.
///
/// - 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, 08-JUL-1990 (NJB)
/// ```
pub fn vdist(v1: &[f64; 3], v2: &[f64; 3]) -> f64 {
let ret = VDIST(v1, v2);
ret
}
//$Procedure VDIST ( Vector distance )
pub fn VDIST(V1: &[f64], V2: &[f64]) -> f64 {
let V1 = DummyArray::new(V1, 1..=3);
let V2 = DummyArray::new(V2, 1..=3);
let mut VDIST: f64 = 0.0;
let mut DIFF = StackArray::<f64, 3>::new(1..=3);
//
// SPICELIB functions
//
//
// Local variables
//
//
// No surprises.
//
VSUB(V1.as_slice(), V2.as_slice(), DIFF.as_slice_mut());
VDIST = VNORM(DIFF.as_slice());
VDIST
}