exprand

exprand --  Exponential distribution random number generator (positive values only).

Description

Exponential distribution random number generator (positive values only). This is an x-class noise generator.

Syntax

ar exprand krange

ir exprand krange

kr exprand krange

Performance

krange -- the range of the random numbers (0 - krange). Outputs only positive numbers.

For more detailed explanation of these distributions, see:

  1. C. Dodge - T.A. Jerse 1985. Computer music. Schirmer books. pp.265 - 286

  2. D. Lorrain. A panoply of stochastic cannons. In C. Roads, ed. 1989. Music machine . Cambridge, Massachusetts: MIT press, pp. 351 - 379.

Examples

Here is an example of the exprand opcode. It uses the files exprand.orc and exprand.sco.

Example 1. Example of the exprand opcode.

/* exprand.orc */
/* Written by Kevin Conder */
; Initialize the global variables.
sr = 44100
kr = 4410
ksmps = 10
nchnls = 1

; Instrument #1.
instr 1
  ; Generate a random between 0 and 1.
  ; krange = 1

  i1 exprand 1

  print i1
endin
/* exprand.orc */
        
/* exprand.sco */
/* Written by Kevin Conder */
; Play Instrument #1 for one second.
i 1 0 1
e
/* exprand.sco */
        
Its output should include a line like this:
instr 1:  i1 = 0.174
      

See Also

betarand, bexprnd, cauchy, gauss, linrand, pcauchy, poisson, trirand, unirand, weibull

Credits

Author: Paris Smaragdis
MIT, Cambridge
1995