randomh
Prev | Orchestra Opcodes and Operators | Next

## randomh

randomh — Generates random numbers with a user-defined limit and holds them for a period of time.

## Description

Generates random numbers with a user-defined limit and holds them for a period of time.

## Syntax

    ares randomh kmin, kmax, xcps [,imode] [,ifirstval]

    kres randomh kmin, kmax, kcps [,imode] [,ifirstval]

## Initialization

imode (optional, default=0) -- generation mode of the first output value (see below)

ifirstval (optional, default=0) -- first output value

## Performance

kmin -- minimum range limit

kmax -- maximum range limit

kcps, xcps -- rate of random break-point generation

The randomh opcode is similar to randh but allows the user to set arbitrary minimum and maximum values.

When imode = 0 (the default), the kmin argument value is outputted during 1/kcps (resp. 1/xcps) seconds at the beginning of the note. Then, the normal process takes place with a new random number generated and held every 1/kcps (resp. 1/xcps) seconds.

When imode = 2, the ifirstval argument value is outputted during 1/kcps (resp. 1/xcps) seconds at the beginning of the note. Then, the normal process takes place with a new random number generated and held every 1/kcps (resp. 1/xcps) seconds.

When imode = 3, the generation process begins with a random value from the initialization time.

## Examples

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

Example 700. Example of the randomh 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
    ; Audio out   Audio in
    -odac           -iadc    ;;;RT audio I/O
    ; For Non-realtime ouput leave only the line below:
    ; -o randomh.wav -W ;;; for file output any platform
    </CsOptions>
    <CsInstruments>

    ; Initialize the global variables.
    sr = 44100
    kr = 4410
    ksmps = 10
    nchnls = 1

         seed 0

    ; Instrument #1.
    instr 1
      ; Choose a random frequency between 220 and 440 Hz.
      ; Generate new random numbers at 10 Hz.
      kmin    init 220
      kmax    init 440
      kcps    init 10
      imode   =    p4
      ifstval =    p5

         printf_i "\nMode: %d\n", 1, imode
      k1 randomh kmin, kmax, kcps, imode, ifstval
         printk2 k1
    endin

    </CsInstruments>
    <CsScore>

    ; Play Instrument #1 for one second,
    ; each time with a different mode.
    i 1 0 1
    i 1 1 1 2 330
    i 1 2 1 3
    e

    </CsScore>
    </CsoundSynthesizer>

Its output should include lines like this:

    Mode: 0
     i1   220.00000
     i1   396.26079
     i1   240.75446
     i1   364.24577
        ...

    Mode: 2
     i1   330.00000
     i1   416.50935
     i1   356.11619
     i1   433.59324
        ...

    Mode: 3
     i1   261.17741
     i1   402.00891
     i1   393.86592
     i1   307.19839
        ...

## See Also

randh, random, randomi

## Credits

Author: Gabriel Maldonado

Arguments imode and ifirstval added by François Pinot, Jan. 2011, after a discussion with Peiman Khosravi on the csnd list.

Example written by Kevin Conder, adapted for new args by François Pinot.

Prev | Up | Next
random | Home | randomi