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