/usr/lib/slepcdir/3.7.3/x86_64-linux-gnu-real/include/slepcmath.h is in libslepc3.7.3-dev 3.7.3+dfsg1-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 | /*
SLEPc mathematics include file. Defines basic operations and functions.
This file is included by slepcsys.h and should not be used directly.
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SLEPc - Scalable Library for Eigenvalue Problem Computations
Copyright (c) 2002-2016, Universitat Politecnica de Valencia, Spain
This file is part of SLEPc.
SLEPc is free software: you can redistribute it and/or modify it under the
terms of version 3 of the GNU Lesser General Public License as published by
the Free Software Foundation.
SLEPc is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
more details.
You should have received a copy of the GNU Lesser General Public License
along with SLEPc. If not, see <http://www.gnu.org/licenses/>.
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*/
#if !defined(__SLEPCMATH_H)
#define __SLEPCMATH_H
/*
Default tolerance for the different solvers, depending on the precision
*/
#if defined(PETSC_USE_REAL_SINGLE)
# define SLEPC_DEFAULT_TOL 1e-6
#elif defined(PETSC_USE_REAL_DOUBLE)
# define SLEPC_DEFAULT_TOL 1e-8
#elif defined(PETSC_USE_REAL___FLOAT128)
# define SLEPC_DEFAULT_TOL 1e-16
#else
# define SLEPC_DEFAULT_TOL 1e-7
#endif
/*@C
SlepcAbs - Returns sqrt(x**2+y**2), taking care not to cause unnecessary
overflow. It is based on LAPACK's DLAPY2.
Not Collective
Input parameters:
. x,y - the real numbers
Output parameter:
. return - the result
Note:
This function is not available from Fortran.
Level: developer
@*/
PETSC_STATIC_INLINE PetscReal SlepcAbs(PetscReal x,PetscReal y)
{
PetscReal w,z,t,xabs=PetscAbs(x),yabs=PetscAbs(y);
w = PetscMax(xabs,yabs);
z = PetscMin(xabs,yabs);
if (z == 0.0) return w;
t = z/w;
return w*PetscSqrtReal(1.0+t*t);
}
/*MC
SlepcAbsEigenvalue - Returns the absolute value of a complex number given
its real and imaginary parts.
Synopsis:
PetscReal SlepcAbsEigenvalue(PetscScalar x,PetscScalar y)
Not Collective
Input parameters:
+ x - the real part of the complex number
- y - the imaginary part of the complex number
Notes:
This function computes sqrt(x**2+y**2), taking care not to cause unnecessary
overflow. It is based on LAPACK's DLAPY2.
This function is not available from Fortran.
Level: developer
M*/
#if !defined(PETSC_USE_COMPLEX)
#define SlepcAbsEigenvalue(x,y) SlepcAbs(x,y)
#else
#define SlepcAbsEigenvalue(x,y) PetscAbsScalar(x)
#endif
#endif
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