weibull

weibull --  Weibull distribution random number generator (positive values only).

Description

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

Syntax

ar weibull ksigma, ktau

ir weibull ksigma, ktau

kr weibull ksigma, ktau

Performance

ksigma -- scales the spread of the distribution.

ktau -- if greater than one, numbers near ksigma are favored. If smaller than one, small values are favored. If t equals 1, the distribution is exponential. 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 weibull opcode. It uses the files weibull.orc and weibull.sco.

Example 1. Example of the weibull opcode.

/* weibull.orc */
; Initialize the global variables.
sr = 44100
kr = 4410
ksmps = 10
nchnls = 1

; Instrument #1.
instr 1
  ; Generate a random number in a Weibull distribution.
  ; ksigma = 1
  ; ktau = 1

  i1 weibull 1, 1

  print i1
endin
/* weibull.orc */
        
/* weibull.sco */
; Play Instrument #1 for one second.
i 1 0 1
e
/* weibull.sco */
        
Its output should include lines like this:
instr 1:  i1 = 1.834
      

See Also

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

Credits

Author: Paris Smaragdis
MIT, Cambridge
1995

Example written by Kevin Conder.