birnd
Prev | Orchestra Opcodes and Operators | Next

## birnd

birnd — Returns a random number in a bi-polar range.

## Description

Returns a random number in a bi-polar range.

## Syntax

    birnd(x) (init- or control-rate only)

Where the argument within the parentheses may be an expression. These value converters sample a global random sequence, but do not reference seed. The result can be a term in a further expression.

## Performance

Returns a random number in the bipolar range -x to x. rnd and birnd obtain values from a global pseudo-random number generator, then scale them into the requested range. The single global generator will thus distribute its sequence to these units throughout the performance, in whatever order the requests arrive.

## Examples

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

Example 92. Example of the birnd 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
    </CsOptions>
    <CsInstruments>

    sr = 44100
    kr = 4410
    ksmps = 10
    nchnls = 2

    instr 1		; Generate a random number from -1 to 1.

    kbin =	birnd(1)
    	printk .2, kbin

    endin

    </CsInstruments>
    <CsScore>

    i 1 0 1
    i 1 + .
    i 1 + .
    i 1 + .
    i 1 + .
    i 1 + .
    i 1 + .

    e

    </CsScore>
    </CsoundSynthesizer>

Its output should include lines like:

    instr 1:  i1 = 0.94700
    instr 1:  i1 = -0.72119
    instr 1:  i1 = 0.53898
    instr 1:  i1 = 0.05001
    instr 1:  i1 = 0.24533
    instr 1:  i1 = 0.93902
    instr 1:  i1 = 0.43364

## See Also

rnd

## Credits

Author: Barry L. Vercoe
MIT
Cambridge, Massachussetts
1997

Extended in 3.47 to x-rate by John ffitch.

Prev | Up | Next
biquada | Home | bqrez