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# 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 */
    ; 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 */
    ; 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

Example written by Kevin Conder.

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