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//
// GENERATED FILE
//
use super::*;
use crate::SpiceContext;
use f2rust_std::*;
/// Vector linear combination, 3 dimensions
///
/// Compute the vector linear combination of three double precision
/// 3-dimensional vectors.
///
/// # Brief I/O
///
/// ```text
/// VARIABLE I/O DESCRIPTION
/// -------- --- --------------------------------------------------
/// A I Coefficient of V1.
/// V1 I Vector in 3-space.
/// B I Coefficient of V2.
/// V2 I Vector in 3-space.
/// C I Coefficient of V3.
/// V3 I Vector in 3-space.
/// SUM O Linear vector combination A*V1 + B*V2 + C*V3.
/// ```
///
/// # Detailed Input
///
/// ```text
/// A is the double precision scalar variable that multiplies
/// V1.
///
/// V1 is an arbitrary, double precision 3-dimensional vector.
///
/// B is the double precision scalar variable that multiplies
/// V2.
///
/// V2 is an arbitrary, double precision 3-dimensional vector.
///
/// C is the double precision scalar variable that multiplies
/// V3.
///
/// V3 is a double precision 3-dimensional vector.
/// ```
///
/// # Detailed Output
///
/// ```text
/// SUM is the double precision 3-dimensional vector which
/// contains the linear combination
///
/// A * V1 + B * V2 + C * V3
/// ```
///
/// # Exceptions
///
/// ```text
/// Error free.
/// ```
///
/// # Particulars
///
/// ```text
/// The code reflects precisely the following mathematical expression
///
/// For each value of the index I, from 1 to 3:
///
/// SUM(I) = A * V1(I) + B * V2(I) + C * V3(I)
///
/// No error checking is performed to guard against numeric overflow.
/// ```
///
/// # 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) Suppose you have an instrument with an elliptical field
/// of view described by its angular extent along the semi-minor
/// and semi-major axes.
///
/// The following code example demonstrates how to create
/// 16 vectors aiming at visualizing the field-of-view in
/// three dimensional space.
///
///
/// Example code begins here.
///
///
/// PROGRAM VLCOM3_EX1
/// IMPLICIT NONE
///
/// C
/// C SPICELIB functions.
/// C
/// DOUBLE PRECISION TWOPI
///
/// C
/// C Local parameters.
/// C
/// C Define the two angular extends, along the semi-major
/// C (U) and semi-minor (V) axes of the elliptical field
/// C of view, in radians.
/// C
/// DOUBLE PRECISION MAXANG
/// PARAMETER ( MAXANG = 0.07D0 )
///
/// DOUBLE PRECISION MINANG
/// PARAMETER ( MINANG = 0.035D0 )
///
/// C
/// C Local variables.
/// C
/// DOUBLE PRECISION A
/// DOUBLE PRECISION B
/// DOUBLE PRECISION STEP
/// DOUBLE PRECISION THETA
/// DOUBLE PRECISION U ( 3 )
/// DOUBLE PRECISION V ( 3 )
/// DOUBLE PRECISION VECTOR ( 3 )
/// DOUBLE PRECISION Z ( 3 )
///
/// INTEGER I
///
/// C
/// C Let U and V be orthonormal 3-vectors spanning the
/// C focal plane of the instrument, and Z its
/// C boresight.
/// C
/// DATA U / 1.D0, 0.D0, 0.D0 /
/// DATA V / 0.D0, 1.D0, 0.D0 /
/// DATA Z / 0.D0, 0.D0, 1.D0 /
///
/// C
/// C Find the length of the ellipse's axes. Note that
/// C we are dealing with unitary vectors.
/// C
/// A = TAN ( MAXANG )
/// B = TAN ( MINANG )
///
/// C
/// C Compute the vectors of interest and display them
/// C
/// THETA = 0.D0
/// STEP = TWOPI() / 16
///
/// DO I = 1, 16
///
/// CALL VLCOM3 ( 1.D0, Z, A * COS(THETA), U,
/// . B * SIN(THETA), V, VECTOR )
///
/// WRITE(*,'(I2,A,3F10.6)') I, ':', VECTOR
///
/// THETA = THETA + STEP
///
/// END DO
///
/// END
///
///
/// When this program was executed on a Mac/Intel/gfortran/64-bit
/// platform, the output was:
///
///
/// 1: 0.070115 0.000000 1.000000
/// 2: 0.064777 0.013399 1.000000
/// 3: 0.049578 0.024759 1.000000
/// 4: 0.026832 0.032349 1.000000
/// 5: 0.000000 0.035014 1.000000
/// 6: -0.026832 0.032349 1.000000
/// 7: -0.049578 0.024759 1.000000
/// 8: -0.064777 0.013399 1.000000
/// 9: -0.070115 0.000000 1.000000
/// 10: -0.064777 -0.013399 1.000000
/// 11: -0.049578 -0.024759 1.000000
/// 12: -0.026832 -0.032349 1.000000
/// 13: -0.000000 -0.035014 1.000000
/// 14: 0.026832 -0.032349 1.000000
/// 15: 0.049578 -0.024759 1.000000
/// 16: 0.064777 -0.013399 1.000000
/// ```
///
/// # Restrictions
///
/// ```text
/// 1) No error checking is performed to guard against numeric
/// overflow or underflow. The user is responsible for insuring
/// that the input values are reasonable.
/// ```
///
/// # Author and Institution
///
/// ```text
/// J. Diaz del Rio (ODC Space)
/// W.L. Taber (JPL)
/// ```
///
/// # Version
///
/// ```text
/// - SPICELIB Version 1.1.0, 06-JUL-2021 (JDR)
///
/// Added IMPLICIT NONE statement.
///
/// Edited the header to comply with NAIF standard. Added complete
/// code example.
///
/// Added restriction #1.
///
/// - 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, 01-NOV-1990 (WLT)
/// ```
pub fn vlcom3(
a: f64,
v1: &[f64; 3],
b: f64,
v2: &[f64; 3],
c: f64,
v3: &[f64; 3],
sum: &mut [f64; 3],
) {
VLCOM3(a, v1, b, v2, c, v3, sum);
}
//$Procedure VLCOM3 ( Vector linear combination, 3 dimensions )
pub fn VLCOM3(A: f64, V1: &[f64], B: f64, V2: &[f64], C: f64, V3: &[f64], SUM: &mut [f64]) {
let V1 = DummyArray::new(V1, 1..=3);
let V2 = DummyArray::new(V2, 1..=3);
let V3 = DummyArray::new(V3, 1..=3);
let mut SUM = DummyArrayMut::new(SUM, 1..=3);
SUM[1] = (((A * V1[1]) + (B * V2[1])) + (C * V3[1]));
SUM[2] = (((A * V1[2]) + (B * V2[2])) + (C * V3[2]));
SUM[3] = (((A * V1[3]) + (B * V2[3])) + (C * V3[3]));
}