libm_double: Double-Precision Functions (Fortran Library Reference)

Fortran Library Reference

`libm_double`: Double-Precision Functions

The following subprograms are double-precision libm functions and subroutines.

In general, these functions do not correspond to standard FORTRAN generic intrinsic functions--data types are determined by the usual data typing rules.

Example: Subroutine and non-Intrinsic double-precision functions:

    DOUBLE PRECISION c, d_acosh, d_hypot, d_infinity, s, x, y, z 
    ... 
    z = d_acosh( x ) 
    i = id_finite( x ) 
    z = d_hypot( x, y ) 
    z = d_infinity() 
    CALL d_sincos( x, s, c )

These DOUBLE PRECISION functions need to appear in a DOUBLE PRECISION statement.

Refer to the C library man pages for details: the man page for d_acos(x) is acos(3M)

Table 1-5 Double Precision libm Functions


`d_acos( x )` `d_acosd( x )` `d_acosh( x )` `d_acosp(` `x` `)` `d_acospi( x )`	`DOUBLE PRECISION` `DOUBLE PRECISION` `DOUBLE PRECISION` `DOUBLE PRECISION` `DOUBLE PRECISION`	`Function` `Function` `Function` `Function` `Function`	`arc cosine` -- `arc cosh` -- --
`d_atan( x )` `d_atand( x )` `d_atanh( x )` `d_atanp( x )` `d_atanpi( x )`	`DOUBLE PRECISION` `DOUBLE PRECISION` `DOUBLE PRECISION` `DOUBLE PRECISION` `DOUBLE PRECISION`	`Function` `Function` `Function` `Function` `Function`	`arc` `tangent` -- `arc` `tanh` -- --
`d_asin( x )` `d_asind( x )` `d_asinh( x )` `d_asinp( x )` `d_asinpi( x )`	`DOUBLE PRECISION` `DOUBLE PRECISION` `DOUBLE PRECISION` `DOUBLE PRECISION` `DOUBLE PRECISION`	`Function` `Function` `Function` `Function` `Function`	`arc` `sine` -- `arc` `sinh` -- --
`d_atan2(( y, x )` `d_atan2d( y, x )` `d_atan2pi( y, x )`	`DOUBLE PRECISION` `DOUBLE PRECISION` `DOUBLE PRECISION`	`Function` `Function` `Function`	`arc` `tangent` -- --
`d_cbrt(` `x` `)` `d_ceil(` `x` `)` `d_copysign(` `x,` `x` `)`	`DOUBLE PRECISION` `DOUBLE PRECISION` `DOUBLE PRECISION`	`Function` `Function` `Function`	`cube` `root` `ceiling` --
`d_cos( x )` `d_cosd( x )` `d_cosh( x )` `d_cosp( x )` `d_cospi( x )`	`DOUBLE PRECISION` `DOUBLE PRECISION` `DOUBLE PRECISION` `DOUBLE PRECISION` `DOUBLE PRECISION`	`Function` `Function` `Function` `Function` `Function`	`cosine` -- `hyperb` `cos` -- --
`d_erf( x )` `d_erfc( x )`	`DOUBLE PRECISION` `DOUBLE PRECISION`	`Function` `Function`	`error` `func` --
`d_expm1( x )` `d_floor( x )` `d_hypot( x, y )` `d_infinity( )`	`DOUBLE PRECISION` `DOUBLE PRECISION` `DOUBLE PRECISION` `DOUBLE PRECISION`	`Function` `Function` `Function` `Function`	`(e**x)-1` `floor` `hypotenuse` --
`d_j0( x )` `d_j1( x )` `d_jn( x )`	`DOUBLE PRECISION` `DOUBLE PRECISION` `DOUBLE PRECISION`	`Function` `Function` `Function`	`Bessel` -- --
`id_finite( x )` `id_fp_class( x )` `id_ilogb( x )` `id_irint( x )` `id_isinf( x )` `id_isnan( x )` `id_isnormal( x )` `id_issubnormal( x )` `id_iszero( x )` `id_signbit( x )`	`INTEGER` `INTEGER` `INTEGER` `INTEGER` `INTEGER` `INTEGER` `INTEGER` `INTEGER` `INTEGER` `INTEGER`	`Function` `Function` `Function` `Function` `Function` `Function` `Function` `Function` `Function` `Function`
`d_addran()` `d_addrans(x, p, l, u)` `d_lcran()` `d_lcrans(x, p, l, u )` `d_shufrans(x, p, l,u)`	`DOUBLE PRECISION` n/a `DOUBLE PRECISION` n/a n/a	`Function` `Subroutine` `Function` `Subroutine` `Subroutine`	`random` `number` `generators`
`d_lgamma( x )` `d_logb( x )` `d_log1p( x )` `d_log2( x )`	`DOUBLE PRECISION` `DOUBLE PRECISION` `DOUBLE PRECISION` `DOUBLE PRECISION`	`Function` `Function` `Function` `Function`	`log` `gamma` -- -- --
`d_max_normal()` `d_max_subnormal()` `d_min_normal()` `d_min_subnormal()` `d_nextafter( x, y )` `d_quiet_nan( n )` `d_remainder( x, y )` `d_rint( x )` `d_scalb( x, y )` `d_scalbn( x, n )` `d_signaling_nan( n )` `d_significand( x )`	`DOUBLE PRECISION` `DOUBLE PRECISION` `DOUBLE PRECISION` `DOUBLE PRECISION` `DOUBLE PRECISION` `DOUBLE PRECISION` `DOUBLE PRECISION` `DOUBLE PRECISION` `DOUBLE PRECISION` `DOUBLE PRECISION` `DOUBLE PRECISION` `DOUBLE PRECISION`	`Function` `Function` `Function` `Function` `Function` `Function` `Function` `Function` `Function` `Function` `Function` `Function`
`d_sin( x )` `d_sind( x )` `d_sinh( x )` `d_sinp( x )` `d_sinpi( x )`	`DOUBLE PRECISION` `DOUBLE PRECISION` `DOUBLE PRECISION` `DOUBLE PRECISION` `DOUBLE PRECISION`	`Function` `Function` `Function` `Function` `Function`	`sine` -- `hyperb` `sine` -- --
`d_sincos( x, s, c )` `d_sincosd( x, s, c )` `d_sincosp( x, s, c )` `d_sincospi( x, s, c )`	n/a n/a n/a n/a	`Subroutine` `Subroutine` `Subroutine` `Subroutine`	`sine` `and` `cosine` -- --
`d_tan( x )` `d_tand( x )` `d_tanh( x )` `d_tanp( x )` `d_tanpi( x )`	`DOUBLE PRECISION` `DOUBLE PRECISION` `DOUBLE PRECISION` `DOUBLE PRECISION` `DOUBLE PRECISION`	`Function` `Function` `Function` `Function` `Function`	`tangent` -- `hyperb` `tan` -- --
`d_y0( x )` `d_y1( x )` `d_yn( n, x )`	`DOUBLE PRECISION` `DOUBLE PRECISION` `DOUBLE PRECISION`	`Function` `Function` `Function`	`bessel` -- --

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

Explicitly type these functions on a DOUBLE PRECISION statement or with an appropriate IMPLICIT statement).

sind(x), asind(x), ... take degrees rather than radians.

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