f(random_float/0)

Documentation
- Reference manual
  - Built-in Predicates
    - Arithmetic
      - General purpose arithmetic
        
        Arithmetic Functions
        
        -/1
        
        +/1
        
        +/2
        
        -/2
        
        */2
        
        //2
        
        mod/2
        
        rem/2
        
        ///2
        
        div/2
        
        rdiv/2
        
        gcd/2
        
        lcm/2
        
        abs/1
        
        sign/1
        
        cmpr/2
        
        copysign/2
        
        nexttoward/2
        
        roundtoward/2
        
        max/2
        
        maxr/2
        
        min/2
        
        minr/2
        
        ./2
        
        random/1
        
        random_float/0
        
        round/1
        
        integer/1
        
        float/1
        
        rational/1
        
        rationalize/1
        
        numerator/1
        
        denominator/1
        
        float_fractional_part/1
        
        float_integer_part/1
        
        truncate/1
        
        floor/1
        
        ceiling/1
        
        ceil/1
        
        >>/2
        
        <</2
        
        \//2
        
        /\/2
        
        xor/2
        
        \/1
        
        sqrt/1
        
        sin/1
        
        cos/1
        
        tan/1
        
        asin/1
        
        acos/1
        
        atan/1
        
        atan2/2
        
        atan/2
        
        sinh/1
        
        cosh/1
        
        tanh/1
        
        asinh/1
        
        acosh/1
        
        atanh/1
        
        log/1
        
        log10/1
        
        exp/1
        
        **/2
        
        ^/2
        
        powm/3
        
        lgamma/1
        
        erf/1
        
        erfc/1
        
        pi/0
        
        e/0
        
        epsilon/0
        
        inf/0
        
        nan/0
        
        cputime/0
        
        eval/1
        
        msb/1
        
        lsb/1
        
        popcount/1
        
        getbit/2
- Packages

Availability:Arithmetic function (see is/2)

Evaluate to a random float I for which 0.0 < i < 1.0. This function shares the random state with random/1. All remarks with the function random/1 also apply for random_float/0. Note that both sides of the domain are open. This avoids evaluation errors on, e.g., log/1 or //2 while no practical application can expect 0.0.^{129Richard
O'Keefe said: “If you are generating IEEE doubles with
the claimed uniformity, then 0 has a 1 in 2^53 = 1 in
9,007,199,254,740,992 chance of turning up. No program that
expects [0.0,1.0) is going to be surprised when 0.0 fails to turn up in
a few millions of millions of trials, now is it? But a program that
expects (0.0,1.0) could be devastated if 0.0 did turn up.’}