/usr/include/Faddeeva.h is in libopenspecfun-dev 0.5.3-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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*/
/* Available at: http://ab-initio.mit.edu/Faddeeva
Header file for Faddeeva.c; see Faddeeva.cc for more information. */
#ifndef FADDEEVA_H
#define FADDEEVA_H 1
// Require C99 complex-number support
#ifdef USE_OPENLIBM
# include <openlibm_complex.h>
#else
# include <math.h>
# include <complex.h>
#endif
#ifdef __cplusplus
extern "C"
{
#endif /* __cplusplus */
// compute w(z) = exp(-z^2) erfc(-iz) [ Faddeeva / scaled complex error func ]
extern double complex Faddeeva_w(double complex z,double relerr);
extern double Faddeeva_w_im(double x); // special-case code for Im[w(x)] of real x
// Various functions that we can compute with the help of w(z)
// compute erfcx(z) = exp(z^2) erfc(z)
extern double complex Faddeeva_erfcx(double complex z, double relerr);
extern double Faddeeva_erfcx_re(double x); // special case for real x
// compute erf(z), the error function of complex arguments
extern double complex Faddeeva_erf(double complex z, double relerr);
extern double Faddeeva_erf_re(double x); // special case for real x
// compute erfi(z) = -i erf(iz), the imaginary error function
extern double complex Faddeeva_erfi(double complex z, double relerr);
extern double Faddeeva_erfi_re(double x); // special case for real x
// compute erfc(z) = 1 - erf(z), the complementary error function
extern double complex Faddeeva_erfc(double complex z, double relerr);
extern double Faddeeva_erfc_re(double x); // special case for real x
// compute Dawson(z) = sqrt(pi)/2 * exp(-z^2) * erfi(z)
extern double complex Faddeeva_Dawson(double complex z, double relerr);
extern double Faddeeva_Dawson_re(double x); // special case for real x
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif // FADDEEVA_H
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