libm_single: Single-Precision Functions (Fortran Library Reference)

Fortran Library Reference

`libm_single`: Single-Precision Functions

These subprograms are single-precision libm functions and subroutines.

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

Samples: Single-precision libm functions:

    REAL c, s, x, y, z 
    ..
    z = r_acosh( x ) 
    i = ir_finite( x ) 
    z = r_hypot( x, y ) 
    z = r_infinity() 
    CALL r_sincos( x, s, c )

These functions need not be explicitly typed with a REAL statement as long as default typing holds. (Variables 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 1-7 Single-Precision libm functions


`r_acos( x )` `r_acosd( x )` `r_acosh( x )` `r_acosp( x )` `r_acospi( x )`	`REAL` `REAL` `REAL` `REAL` `REAL`	`Function` `Function` `Function` `Function` `Function`	`arc` `cosine` -- `arc` `cosh` -- --
`r_atan( x )` `r_atand( x )` `r_atanh( x )` `r_atanp( x )` `r_atanpi( x )`	`REAL` `REAL` `REAL` `REAL` `REAL`	`Function` `Function` `Function` `Function` `Function`	`arc` `tangent` -- `arc` `tanh` -- --
`r_asin( x )` `r_asind( x )` `r_asinh( x )` `r_asinp( x )` `r_asinpi( x )`	`REAL` `REAL` `REAL` `REAL` `REAL`	`Function` `Function` `Function` `Function` `Function`	`arc` `sine` -- `arc` `sinh` -- --
`r_atan2(( y, x )` `r_atan2d( y, x )` `r_atan2pi( y, x )`	`REAL` `REAL` `REAL`	`Function` `Function` `Function`	`arc` `tangent` -- --
`r_cbrt( x )` `r_ceil( x )` `r_copysign( x, y )`	`REAL` `REAL` `REAL`	`Function` `Function` `Function`	`cube` `root` `ceiling` --
`r_cos( x )` `r_cosd( x )` `r_cosh( x )` `r_cosp( x )` `r_cospi( x )`	`REAL` `REAL` `REAL` `REAL` `REAL`	`Function` `Function` `Function` `Function` `Function`	`cosine` -- `hyperb` `cos` -- --
`r_erf( x )` `r_erfc( x )`	`REAL` `REAL`	`Function` `Function`	`err` `function` --
`r_expm1( x )` `r_floor( x )` `r_hypot( x, y )` `r_infinity( )` `r_j0( x )` `r_j1( x )` `r_jn( x )`	`REAL` `REAL` `REAL` `REAL` `REAL` `REAL` `REAL`	`Function` `Function` `Function` `Function` `Function` `Function` `Function`	`(e**x)-1` `floor` `hypotenuse` `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`	`Function` `Function` `Function` `Function` `Function` `Function` `Function` `Function` `Function` `Function`	-- -- -- -- -- -- -- -- -- --
`r_addran()` `r_addrans( x, p, l, u )` `r_lcran()` `r_lcrans( x, p, l, u )` `r_shufrans(x, p, l, u)`	`REAl` n/a `REAL` n/a n/a	`Function` `Subroutine` `Function` `Subroutine` `Subroutine`	`random` `number` -- -- -- --
`r_lgamma( x )` `r_logb( x )` `r_log1p( x )` `r_log2( x )`	`REAL` `REAL` `REAL` `REAL`	`Function` `Function` `Function` `Function`	`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`	`Function` `Function` `Function` `Function` `Function` `Function` `Function` `Function` `Function` `Function` `Function` `Function`
`r_sin( x )` `r_sind( x )` `r_sinh( x )` `r_sinp( x )` `r_sinpi( x )`	`REAL` `REAL` `REAL` `REAL` `REAL`	`Function` `Function` `Function` `Function` `Function`	`sine` -- `hyperb sin` -- --
`r_sincos( x, s, c )` `r_sincosd( x, s, c )` `r_sincosp( x, s, c )` `r_sincospi( x, s, c )`	n/a n/a n/a n/a	`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`	`Function` `Function` `Function` `Function` `Function`	`tangent` -- `hyperb` `tan` -- --
`r_y0( x )` `r_y1( x )` `r_yn( n, x )`	`REAL` `REAL` `REAL`	`Function` `Function` `Function`	`bessel` -- --

Variables c, l, p, s, u, x, and y are of type REAL.

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.