an open-source digital signal processing and sound synthesis language
about · links · contact
random - return a random number between 0 and 1


Synopsis

value = random()


Description

Call random to get a random number between 0 and 1, inclusive.

It's a good idea to call srand once to seed the random number generator before using random. Otherwise, a seed of 1 will be used.

There are no arguments to random.


Examples

   srand(1)
   for (i = 0; i < 10; i = i + 1) {
      randval = random() * 1000
      print(randval)
   }

prints 10 random numbers having values between 0 and 1000, inclusive.

The following complete CMIX script plays repeated notes of the same pitch, sprayed randomly across the stereo field. This is easy to do, because the stereo_loc argument to most instruments has the same range as the value returned by random.

   rtsetparams(44100, 2)
   load("WAVETABLE")

   reset(20000)   /* short notes need high control rate */
   ampenv = maketable("line", 1000, 0,0, 1,0, 10,1, 40,0)
   wavetable = maketable("wave", 1000, 1, 1, 1, 1, 1, 1, 0.5)

   srand(10)
   amp = 8000
   freq = 80
   dur = 0.04
   for (start = 0; start < 8; start = start + 0.11) {
      stereo_loc = random()
      WAVETABLE(start, dur, amp, freq, stereo_loc, wavetable)
   }


See Also

irand, srand, trand, rand, pickrand, pickwrand, spray_init, get_spray, maketable("random")