1.3.1 Single-Precision Functions (Sun Studio 12: Fortran Library Reference)

Sun Studio 12: Fortran Library Reference

1.3.1 Single-Precision Functions

These subprograms are single-precision math functions and subroutines.

In general, the functions below provide access to single-precision math functions that do not correspond to standard Fortran generic intrinsic functions—data types are determined by the usual data typing rules.

These functions need not be explicitly typed with a REAL statement as long as default typing holds. (Names beginning with “r” are REAL, with “i” are INTEGER.)

For details on these routines, see the C math library man pages (3M). For example, for r_acos(x) see the acos(3M) man page.

Table 1–2 Single-Precision Math Functions


Function Name	Return Type	Description
`r_acos``( x )` `r_acosd``( x )` `r_acosh``( x )` `r_acosp``( x )` `r_acospi``( x )`	`REAL` `REAL` `REAL` `REAL` `REAL`	`arc cosine` `--` `arc cosh` `--` `--`
`r_atan``( x )` `r_atand``( x )` `r_atanh``( x )` `r_atanp``( x )` `r_atanpi``( x )`	`REAL` `REAL` `REAL` `REAL` `REAL`	`arc tangent` `--` `arc tanh` `--` `--`
`r_asin``( x )` `r_asind``( x )` `r_asinh``( x )` `r_asinp``( x )` `r_asinpi``( x )`	`REAL` `REAL` `REAL` `REAL` `REAL`	`arc sine` `--` `arc sinh` `--` `--`
`r_atan2``( y, x )` `r_atan2d``( y, x )` `r_atan2pi``( y, x )`	`REAL` `REAL` `REAL`	`arc tangent` `--` `--`
`r_cbrt``( x )` `r_ceil``( x )` `r_copysign``( x, y )`	`REAL` `REAL` `REAL`	`cube root` `ceiling` `--`
`r_cos``( x )` `r_cosd``( x )` `r_cosh``( x )` `r_cosp``( x )` `r_cospi``( x )`	`REAL` `REAL` `REAL` `REAL` `REAL`	`cosine` `--` `hyperb cos` `--` `--`
`r_erf``( x )` `r_erfc``( x )`	`REAL` `REAL`	`err function` `--`
`r_expm1``( x )` `r_floor``( x )` `r_hypot``( x, y )` `r_infinity``( )`	`REAL` `REAL` `REAL` `REAL`	`(ex)-1` `floor` `hypotenuse` `--`**
`r_j0( x )` `r_j1( x )` `r_jn(n, x )`	`REAL` `REAL` `REAL`	`Bessel--` `--`
`ir_finite``( x )` `ir_fp_class``( x )` `ir_ilogb``( x )` `ir_irint``( x )` `ir_isinf``( x )` `ir_isnan``( x )` `ir_isnormal``( x )` `ir_issubnormal``( x )` `ir_iszero``( x )` `ir_signbit``( x )`	`INTEGER` `INTEGER` `INTEGER` `INTEGER` `INTEGER` `INTEGER` `INTEGER` `INTEGER` `INTEGER` `INTEGER`	`--` `--` `--` `--` `--` `--` `--` `--` `--` `--`
`r_addran``()` `r_addrans``( x, p, l, u )` `r_lcran``()` `r_lcrans``( x, p, l, u )` `r_shufrans``(x, p, l, u)`	`REAL` `subroutineREAL` `subroutine` `subroutine`	`randomnumbergenerators`
`r_lgamma( x )` `r_logb``( x )` `r_log1p``( x )` `r_log2``( x )`	`REAL` `REAL` `REAL` `REAL`	`log gamma` `--` `--` `--`
`r_max_normal``()` `r_max_subnormal``()` `r_min_normal``()` `r_min_subnormal``()` `r_nextafter``( x, y )` `r_quiet_nan``( n )` `r_remainder``( x, y )` `r_rint``( x )` `r_scalb``( x, y )` `r_scalbn``( x, n )` `r_signaling_nan``( n )` `r_significand``( x )`	`REAL` `REAL` `REAL` `REAL` `REAL` `REAL` `REAL` `REAL` `REAL` `REAL` `REAL` `REAL`
`r_sin``( x )` `r_sind``( x )` `r_sinh``( x )` `r_sinp``( x )` `r_sinpi``( x )`	`REAL` `REAL` `REAL` `REAL` `REAL`	`sine` `--` `hyperb sin` `--` `--`
`r_sincos``( x, s, c )` `r_sincosd``( x, s, c )` `r_sincosp``( x, s, c )` `r_sincospi``( x, s, c )`	`subroutine` `subroutine` `subroutine` `subroutine`	`sine & cosine` `--` `--` `--`
`r_tan``( x )` `r_tand``( x )` `r_tanh``( x )` `r_tanp``( x )` `r_tanpi``( x )`	`REAL` `REAL` `REAL` `REAL` `REAL`	`tangent` `--` `hyperb tan` `--` `--`
`r_y0( x )` `r_y1( x )` `r_yn( n, x )`	`REAL` `REAL` `REAL`	`bessel` `--` `--`

Variables c, l, p, s, u, x, and y are of type REAL. Variable n is of type INTEGER.
Type these functions as explicitly REAL if an IMPLICIT statement is in effect that types names starting with “r” to some other date type.
sind(x), asind(x), … take degrees rather than radians.

See also: intro(3M) and the Numerical Computation Guide.