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//
// GENERATED FILE
//
use super::*;
use crate::SpiceContext;
use f2rust_std::*;
/// Double precision arc hyperbolic cosine
///
/// Return the inverse hyperbolic cosine of a double precision
/// argument.
///
/// # Brief I/O
///
/// ```text
/// VARIABLE I/O DESCRIPTION
/// -------- --- --------------------------------------------------
/// X I Number whose inverse hyperbolic cosine is desired.
///
/// The function returns the inverse hyperbolic cosine of a double
/// precision number.
/// ```
///
/// # Detailed Input
///
/// ```text
/// X is any double precision number greater than or equal to
/// 1.
/// ```
///
/// # Detailed Output
///
/// ```text
/// The function returns the inverse hyperbolic cosine of the double
/// precision number X.
/// ```
///
/// # Exceptions
///
/// ```text
/// 1) If X is less than 1.0D0, the error SPICE(INVALIDARGUMENT) is
/// signaled.
/// ```
///
/// # Particulars
///
/// ```text
/// This function simply implements the definition of the inverse
/// hyperbolic cosine as follows:
///
/// DACOSH = DLOG (X + DSQRT (X*X-1.D0))
///
/// If the input value is not valid, an error is signaled.
/// ```
///
/// # Examples
///
/// ```text
/// The following table gives a few values for X and the resulting
/// value of DACOSH.
///
/// X DACOSH(X)
/// ----------------------------------------------
/// 1.000000000000000 0.0000000000000000E+00
/// 10.00000000000000 2.993222846126381
/// 100.0000000000000 5.298292365610485
/// 1000.000000000000 7.600902209541989
/// ```
///
/// # Restrictions
///
/// ```text
/// 1) The value of the input variable X must be greater than or
/// equal to 1.0d0.
/// ```
///
/// # Literature References
///
/// ```text
/// [1] W.H. Beyer, "CRC Standard Mathematical Tables," CRC Press,
/// 1987.
/// ```
///
/// # Author and Institution
///
/// ```text
/// J. Diaz del Rio (ODC Space)
/// H.A. Neilan (JPL)
/// W.M. Owen (JPL)
/// W.L. Taber (JPL)
/// ```
///
/// # Version
///
/// ```text
/// - SPICELIB Version 1.2.0, 17-JUN-2021 (JDR)
///
/// Added IMPLICIT NONE statement.
///
/// Edited the header to comply with NAIF standard.
///
/// - SPICELIB Version 1.1.0, 17-MAY-1994 (HAN)
///
/// Set the default function value to either 0, 0.0D0, .FALSE.,
/// or blank depending on the type of the function.
///
/// - 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 dacosh(ctx: &mut SpiceContext, x: f64) -> crate::Result<f64> {
let ret = DACOSH(x, ctx.raw_context())?;
ctx.handle_errors()?;
Ok(ret)
}
//$Procedure DACOSH ( Double precision arc hyperbolic cosine )
pub fn DACOSH(X: f64, ctx: &mut Context) -> f2rust_std::Result<f64> {
let mut DACOSH: f64 = 0.0;
//
// SPICELIB functions
//
//
// Set up the error processing.
//
if RETURN(ctx) {
DACOSH = 0.0;
return Ok(DACOSH);
} else {
CHKIN(b"DACOSH", ctx)?;
DACOSH = 0.0;
}
//
// Check that X >= 1.
//
if (X < 1.0) {
SETMSG(b"DACOSH: Invalid argument, X is less than one.", ctx);
SIGERR(b"SPICE(INVALIDARGUMENT)", ctx)?;
CHKOUT(b"DACOSH", ctx)?;
return Ok(DACOSH);
}
//
// Abiding by the order implied by the parentheses in the expression
// (1.0D0/X)/X prevents floating point overflow that might occur for
// large values of X if the equivalent expression, 1.0D0/(X*X), were
// used.
//
DACOSH = f64::ln((X + (X * f64::sqrt((1.0 - ((1.0 / X) / X))))));
CHKOUT(b"DACOSH", ctx)?;
Ok(DACOSH)
}