exprandi
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## exprandi

exprandi — Exponential distribution random number generator with interpolation (positive values only).

## Description

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

## Syntax

    ares exprandi klambda, xamp, xcps

    ires exprandi klambda, xamp, xcps

    kres exprandi klambda, xamp, xcps

## Performance

klambda -- lambda parameter for the exponential distribution.

The probablity density function of an exponential distribution is an exponential curve, whose mean is 0.69515/lambda. 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.

xamp -- range over which random numbers are distributed.

xcps -- the frequency which new random numbers are generated.

## Examples

Here is an example of the exprandi opcode. It uses the file exprandi.csd.

Example 282. Example of the exprandi opcode.

See the sections Real-time Audio and Command Line Flags for more information on using command line flags.

    <CsoundSynthesizer>
    <CsOptions>
    ; Select audio/midi flags here according to platform
    -odac     ;;;realtime audio out
    ;-iadc    ;;;uncomment -iadc if realtime audio input is needed too
    ; For Non-realtime ouput leave only the line below:
    ; -o exprand.wav -W ;;; for file output any platform
    </CsOptions>
    <CsInstruments>

    sr = 44100
    ksmps = 32
    nchnls = 2
    0dbfs = 1

    instr 1
    klambda	exprandi	20, 1, 3
    	printk2 klambda		; look
    aout	oscili	0.8, 440+klambda, 1	; & listen
    	outs	aout, aout
    endin

    </CsInstruments>
    <CsScore>
    ; sine wave
    f 1 0 16384 10 1

    i 1 0 4
    e

    </CsScore>
    </CsoundSynthesizer>

## See also

Random (Noise) Generators

## Credits

Author: John ffitch
Bath
May 2011
New in version 5.14

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