1 /* $Id: petscmath.h,v 1.9 1998/06/01 21:33:42 balay Exp balay $ */ 2 /* 3 4 PETSc mathematics include file. Defines certain basic mathematical 5 constants and functions for working with single and double precision 6 floating point numbers as well as complex and integers. 7 8 */ 9 10 #if !defined(__PETSCMATH_PACKAGE) 11 #define __PETSCMATH_PACKAGE 12 #include <math.h> 13 14 /* 15 16 Defines operations that are different for complex and real numbers; 17 note that one cannot really mix the use of complex and real in the same 18 PETSc program. All PETSc objects in one program are built around the object 19 Scalar which is either always a double or a complex. 20 21 */ 22 #if defined(USE_PETSC_COMPLEX) 23 24 #if defined (PARCH_nt) 25 #include <complex> 26 #elif defined(HAVE_NONSTANDARD_COMPLEX_H) 27 #include HAVE_NONSTANDARD_COMPLEX_H 28 #else 29 #include <complex.h> 30 #endif 31 32 extern MPI_Datatype MPIU_COMPLEX; 33 #define MPIU_SCALAR MPIU_COMPLEX 34 #if defined (PARCH_nt) 35 #define PetscReal(a) (a).real() 36 #define PetscImaginary(a) (a).imag() 37 #define PetscAbsScalar(a) std::abs(a) 38 #define PetscConj(a) std::conj(a) 39 #define PetscSqrtScalar(a) std::sqrt(a) 40 #else 41 #define PetscReal(a) real(a) 42 #define PetscImaginary(a) imag(a) 43 #define PetscAbsScalar(a) abs(a) 44 #define PetscConj(a) conj(a) 45 #define PetscSqrtScalar(a) sqrt(a) 46 #endif 47 /* 48 The new complex class for GNU C++ is based on templates and is not backward 49 compatible with all previous complex class libraries. 50 */ 51 #if defined(PARCH_nt) 52 #define Scalar std::complex<double> 53 #elif defined(USES_TEMPLATED_COMPLEX) 54 #define Scalar complex<double> 55 #else 56 #define Scalar complex 57 #endif 58 59 /* Compiling for real numbers only */ 60 #else 61 #define MPIU_SCALAR MPI_DOUBLE 62 #define PetscReal(a) (a) 63 #define PetscImaginary(a) (a) 64 #define PetscAbsScalar(a) ( ((a)<0.0) ? -(a) : (a) ) 65 #define Scalar double 66 #define PetscConj(a) (a) 67 #define PetscSqrtScalar(a) sqrt(a) 68 #endif 69 70 /* --------------------------------------------------------------------------*/ 71 72 /* 73 Certain objects may be created using either single 74 or double precision. 75 */ 76 typedef enum { SCALAR_DOUBLE, SCALAR_SINGLE } ScalarPrecision; 77 78 /* PETSC_i is the imaginary number, i */ 79 extern Scalar PETSC_i; 80 81 #define PetscMin(a,b) ( ((a)<(b)) ? (a) : (b) ) 82 #define PetscMax(a,b) ( ((a)<(b)) ? (b) : (a) ) 83 #define PetscAbsInt(a) ( ((a)<0) ? -(a) : (a) ) 84 #define PetscAbsDouble(a) ( ((a)<0) ? -(a) : (a) ) 85 86 /* ----------------------------------------------------------------------------*/ 87 /* 88 Basic constants 89 */ 90 #define PETSC_PI 3.14159265358979323846264 91 #define PETSC_DEGREES_TO_RADIANS 0.01745329251994 92 #define PETSC_MAX 1.e300 93 #define PETSC_MIN -1.e300 94 #define PETSC_MAX_INT 1000000000; 95 #define PETSC_MIN_INT -1000000000; 96 97 /* ----------------------------------------------------------------------------*/ 98 /* 99 PLogDouble variables are used to contain double precision numbers 100 that are not used in the numerical computations, but rather in logging, 101 timing etc. 102 */ 103 typedef double PLogDouble; 104 /* 105 Once PETSc is compiling with a ADIC enhanced version of MPI 106 we will create a new MPI_Datatype for the inactive double variables. 107 */ 108 #if defined(AD_DERIV_H) 109 /* extern MPI_Datatype MPIU_PLOGDOUBLE; */ 110 #else 111 #if !defined(PETSC_USING_MPIUNI) 112 #define MPIU_PLOGDOUBLE MPI_DOUBLE 113 #endif 114 #endif 115 116 117 #endif 118