rfa 0.5.9

A port ERFA to Rust.
Documentation 
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///  p-vector outer (=vector=cross) product.
///
///  Given:
///     a        double[3]      first p-vector
///     b        double[3]      second p-vector
///
///  Returned:
///     axb      double[3]      a x b
///
///
///  This revision:  2021 May 11

pub fn pxp(a: &[f64;3], b: &[f64; 3], axb: &mut [f64; 3])
{
    let xa = a[0];
    let ya = a[1];
    let za = a[2];
    let xb = b[0];
    let yb = b[1];
    let zb = b[2];
    axb[0] = ya*zb - za*yb;
    axb[1] = za*xb - xa*zb;
    axb[2] = xa*yb - ya*xb;
 
 /* Finished. */
 
 }