xref: /petsc/include/petscmath.h (revision debe9ee2755b2e6ee26f815bab511dcc308e711d)

/*

      PETSc mathematics include file. Defines certain basic mathematical
    constants and functions for working with single, double, and quad precision
    floating point numbers as well as complex single and double.

    This file is included by petscsys.h and should not be used directly.

*/

#if !defined(__PETSCMATH_H)
#define __PETSCMATH_H
#include <math.h>

PETSC_EXTERN MPI_Datatype MPIU_2SCALAR;
PETSC_EXTERN MPI_Datatype MPIU_2INT;

/*

     Defines operations that are different for complex and real numbers;
   note that one cannot mix the use of complex and real in the same
   PETSc program. All PETSc objects in one program are built around the object
   PetscScalar which is either always a real or a complex.

*/

#define PetscExpPassiveScalar(a) PetscExpScalar()
#if defined(PETSC_USE_REAL_SINGLE)
#define MPIU_REAL   MPI_FLOAT
typedef float PetscReal;
#define PetscSqrtReal(a)    sqrt(a)
#elif defined(PETSC_USE_REAL_DOUBLE)
#define MPIU_REAL   MPI_DOUBLE
typedef double PetscReal;
#define PetscSqrtReal(a)    sqrt(a)
#elif defined(PETSC_USE_REAL___FLOAT128)
#if defined(__cplusplus)
extern "C" {
#endif
#include <quadmath.h>
#if defined(__cplusplus)
}
#endif
#define MPIU_REAL MPIU___FLOAT128
typedef __float128 PetscReal;
#define PetscSqrtReal(a)    sqrtq(a)
#endif /* PETSC_USE_REAL_* */

/*
    Complex number definitions
 */
#if defined(PETSC_USE_COMPLEX)
#if defined(PETSC_CLANGUAGE_CXX)
/* C++ support of complex number */
#if defined(PETSC_HAVE_CUSP)
#define complexlib cusp
#include <cusp/complex.h>
#else
#define complexlib std
#include <complex>
#endif

#define PetscRealPart(a)      (a).real()
#define PetscImaginaryPart(a) (a).imag()
#define PetscAbsScalar(a)     complexlib::abs(a)
#define PetscConj(a)          complexlib::conj(a)
#define PetscSqrtScalar(a)    complexlib::sqrt(a)
#define PetscPowScalar(a,b)   complexlib::pow(a,b)
#define PetscExpScalar(a)     complexlib::exp(a)
#define PetscLogScalar(a)     complexlib::log(a)
#define PetscSinScalar(a)     complexlib::sin(a)
#define PetscCosScalar(a)     complexlib::cos(a)

#if defined(PETSC_USE_REAL_SINGLE)
typedef complexlib::complex<float> PetscScalar;
#elif defined(PETSC_USE_REAL_DOUBLE)
typedef complexlib::complex<double> PetscScalar;
#endif  /* PETSC_USE_REAL_ */

#else /* PETSC_CLANGUAGE_CXX */

#if defined(PETSC_USE_REAL_SINGLE)
typedef float complex PetscScalar;

#define PetscRealPart(a)      crealf(a)
#define PetscImaginaryPart(a) cimagf(a)
#define PetscAbsScalar(a)     cabsf(a)
#define PetscConj(a)          conjf(a)
#define PetscSqrtScalar(a)    csqrtf(a)
#define PetscPowScalar(a,b)   cpowf(a,b)
#define PetscExpScalar(a)     cexpf(a)
#define PetscLogScalar(a)     clogf(a)
#define PetscSinScalar(a)     csinf(a)
#define PetscCosScalar(a)     ccosf(a)

#elif defined(PETSC_USE_REAL_DOUBLE)
typedef double complex PetscScalar;

#define PetscRealPart(a)      creal(a)
#define PetscImaginaryPart(a) cimag(a)
#define PetscAbsScalar(a)     cabs(a)
#define PetscConj(a)          conj(a)
#define PetscSqrtScalar(a)    csqrt(a)
#define PetscPowScalar(a,b)   cpow(a,b)
#define PetscExpScalar(a)     cexp(a)
#define PetscLogScalar(a)     clog(a)
#define PetscSinScalar(a)     csin(a)
#define PetscCosScalar(a)     ccos(a)

#endif /* PETSC_USE_REAL_* */
#endif /* PETSC_CLANGUAGE_CXX */

#if defined(PETSC_HAVE_MPI_C_DOUBLE_COMPLEX)
#define MPIU_C_DOUBLE_COMPLEX MPI_C_DOUBLE_COMPLEX
#define MPIU_C_COMPLEX MPI_C_COMPLEX
#else
PETSC_EXTERN MPI_Datatype MPIU_C_DOUBLE_COMPLEX;
PETSC_EXTERN MPI_Datatype MPIU_C_COMPLEX;
#endif /* PETSC_HAVE_MPI_C_DOUBLE_COMPLEX */

#if defined(PETSC_USE_REAL_SINGLE)
#define MPIU_SCALAR MPIU_C_COMPLEX
#elif defined(PETSC_USE_REAL_DOUBLE)
#define MPIU_SCALAR MPIU_C_DOUBLE_COMPLEX
#endif /* PETSC_USE_REAL_* */

/*
    real number definitions
 */
#else /* PETSC_USE_COMPLEX */
#if defined(PETSC_USE_REAL_SINGLE)
#define MPIU_SCALAR           MPI_FLOAT
typedef float PetscScalar;
#elif defined(PETSC_USE_REAL_DOUBLE)
#define MPIU_SCALAR           MPI_DOUBLE
typedef double PetscScalar;
#elif defined(PETSC_USE_REAL___FLOAT128)
PETSC_EXTERN MPI_Datatype MPIU___FLOAT128;
#define MPIU_SCALAR MPIU___FLOAT128
typedef __float128 PetscScalar;
#endif /* PETSC_USE_REAL_* */
#define PetscRealPart(a)      (a)
#define PetscImaginaryPart(a) ((PetscReal)0.)
PETSC_STATIC_INLINE PetscReal PetscAbsScalar(PetscScalar a) {return a < 0.0 ? -a : a;}
#define PetscConj(a)          (a)
#if !defined(PETSC_USE_REAL___FLOAT128)
#define PetscSqrtScalar(a)    sqrt(a)
#define PetscPowScalar(a,b)   pow(a,b)
#define PetscExpScalar(a)     exp(a)
#define PetscLogScalar(a)     log(a)
#define PetscSinScalar(a)     sin(a)
#define PetscCosScalar(a)     cos(a)
#else /* PETSC_USE_REAL___FLOAT128 */
#define PetscSqrtScalar(a)    sqrtq(a)
#define PetscPowScalar(a,b)   powq(a,b)
#define PetscExpScalar(a)     expq(a)
#define PetscLogScalar(a)     logq(a)
#define PetscSinScalar(a)     sinq(a)
#define PetscCosScalar(a)     cosq(a)
#endif /* PETSC_USE_REAL___FLOAT128 */

#endif /* PETSC_USE_COMPLEX */

#define PetscSign(a) (((a) >= 0) ? ((a) == 0 ? 0 : 1) : -1)
#define PetscAbs(a)  (((a) >= 0) ? (a) : -(a))

/* --------------------------------------------------------------------------*/

/*
   Certain objects may be created using either single or double precision.
   This is currently not used.
*/
typedef enum { PETSC_SCALAR_DOUBLE,PETSC_SCALAR_SINGLE, PETSC_SCALAR_LONG_DOUBLE } PetscScalarPrecision;

/* PETSC_i is the imaginary number, i */
PETSC_EXTERN PetscScalar   PETSC_i;

/*MC
   PetscMin - Returns minimum of two numbers

   Synopsis:
   type PetscMin(type v1,type v2)

   Not Collective

   Input Parameter:
+  v1 - first value to find minimum of
-  v2 - second value to find minimum of


   Notes: type can be integer or floating point value

   Level: beginner


.seealso: PetscMin(), PetscClipInterval(), PetscAbsInt(), PetscAbsReal(), PetscSqr()

M*/
#define PetscMin(a,b)   (((a)<(b)) ?  (a) : (b))

/*MC
   PetscMax - Returns maxium of two numbers

   Synopsis:
   type max PetscMax(type v1,type v2)

   Not Collective

   Input Parameter:
+  v1 - first value to find maximum of
-  v2 - second value to find maximum of

   Notes: type can be integer or floating point value

   Level: beginner

.seealso: PetscMin(), PetscClipInterval(), PetscAbsInt(), PetscAbsReal(), PetscSqr()

M*/
#define PetscMax(a,b)   (((a)<(b)) ?  (b) : (a))

/*MC
   PetscClipInterval - Returns a number clipped to be within an interval

   Synopsis:
   type clip PetscClipInterval(type x,type a,type b)

   Not Collective

   Input Parameter:
+  x - value to use if within interval (a,b)
.  a - lower end of interval
-  b - upper end of interval

   Notes: type can be integer or floating point value

   Level: beginner

.seealso: PetscMin(), PetscMax(), PetscAbsInt(), PetscAbsReal(), PetscSqr()

M*/
#define PetscClipInterval(x,a,b)   (PetscMax((a),PetscMin((x),(b))))

/*MC
   PetscAbsInt - Returns the absolute value of an integer

   Synopsis:
   int abs PetscAbsInt(int v1)

   Not Collective

   Input Parameter:
.   v1 - the integer

   Level: beginner

.seealso: PetscMax(), PetscMin(), PetscAbsReal(), PetscSqr()

M*/
#define PetscAbsInt(a)  (((a)<0)   ? -(a) : (a))

/*MC
   PetscAbsReal - Returns the absolute value of an real number

   Synopsis:
   Real abs PetscAbsReal(PetscReal v1)

   Not Collective

   Input Parameter:
.   v1 - the double


   Level: beginner

.seealso: PetscMax(), PetscMin(), PetscAbsInt(), PetscSqr()

M*/
#define PetscAbsReal(a) (((a)<0)   ? -(a) : (a))

/*MC
   PetscSqr - Returns the square of a number

   Synopsis:
   type sqr PetscSqr(type v1)

   Not Collective

   Input Parameter:
.   v1 - the value

   Notes: type can be integer or floating point value

   Level: beginner

.seealso: PetscMax(), PetscMin(), PetscAbsInt(), PetscAbsReal()

M*/
#define PetscSqr(a)     ((a)*(a))

/* ----------------------------------------------------------------------------*/
/*
     Basic constants
*/
#if defined(PETSC_USE_REAL___FLOAT128)
#define PETSC_PI                 M_PIq
#elif defined(M_PI)
#define PETSC_PI                 M_PI
#else
#define PETSC_PI                 3.14159265358979323846264338327950288419716939937510582
#endif

#if !defined(PETSC_USE_64BIT_INDICES)
#define PETSC_MAX_INT            2147483647
#define PETSC_MIN_INT            (-PETSC_MAX_INT - 1)
#else
#define PETSC_MAX_INT            9223372036854775807L
#define PETSC_MIN_INT            (-PETSC_MAX_INT - 1)
#endif

#if defined(PETSC_USE_REAL_SINGLE)
#  define PETSC_MAX_REAL                3.40282346638528860e+38F
#  define PETSC_MIN_REAL                -PETSC_MAX_REAL
#  define PETSC_MACHINE_EPSILON         1.19209290e-07F
#  define PETSC_SQRT_MACHINE_EPSILON    3.45266983e-04F
#  define PETSC_SMALL                   1.e-5
#elif defined(PETSC_USE_REAL_DOUBLE)
#  define PETSC_MAX_REAL                1.7976931348623157e+308
#  define PETSC_MIN_REAL                -PETSC_MAX_REAL
#  define PETSC_MACHINE_EPSILON         2.2204460492503131e-16
#  define PETSC_SQRT_MACHINE_EPSILON    1.490116119384766e-08
#  define PETSC_SMALL                   1.e-10
#elif defined(PETSC_USE_REAL___FLOAT128)
#  define PETSC_MAX_REAL                FLT128_MAX
#  define PETSC_MIN_REAL                -FLT128_MAX
#  define PETSC_MACHINE_EPSILON         FLT128_EPSILON
#  define PETSC_SQRT_MACHINE_EPSILON    1.38777878078e-17
#  define PETSC_SMALL                   1.e-20
#endif

#if defined PETSC_HAVE_ADIC
/* Use MPI_Allreduce when ADIC is not available. */
PETSC_EXTERN PetscErrorCode PetscGlobalMax(MPI_Comm, const PetscReal*,PetscReal*);
PETSC_EXTERN PetscErrorCode PetscGlobalMin(MPI_Comm, const PetscReal*,PetscReal*);
PETSC_EXTERN PetscErrorCode PetscGlobalSum(MPI_Comm, const PetscScalar*,PetscScalar*);
#endif

PETSC_EXTERN PetscErrorCode PetscIsInfOrNanScalar(PetscScalar);
PETSC_EXTERN PetscErrorCode PetscIsInfOrNanReal(PetscReal);

/* ----------------------------------------------------------------------------*/
#define PassiveReal   PetscReal
#define PassiveScalar PetscScalar

/*
    These macros are currently hardwired to match the regular data types, so there is no support for a different
    MatScalar from PetscScalar. We left the MatScalar in the source just in case we use it again.
 */
#define MPIU_MATSCALAR MPIU_SCALAR
typedef PetscScalar MatScalar;
typedef PetscReal MatReal;


#endif