poisson

poisson --  Poisson distribution random number generator (positive values only).

Description

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

Syntax

ar poisson klambda

ir poisson klambda

kr poisson klambda

Performance

klambda -- the mean of the distribution. 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 poisson opcode. It uses the files poisson.orc and poisson.sco.

Example 1. Example of the poisson opcode.

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

; Instrument #1.
instr 1
  ; Generates a random number in a poisson distribution.
  ; klambda = 1

  i1 poisson 1

  print i1
endin
/* poisson.orc */
        
/* poisson.sco */
/* Written by Kevin Conder */
; Play Instrument #1 for one second.
i 1 0 1
e
/* poisson.sco */
        
Its output should include a line like this:
instr 1:  i1 = 1.000
      

See Also

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

Credits

Author: Paris Smaragdis
MIT, Cambridge
1995