Skip to content

random

Generates a controlled pseudo-random number series between min and max values.

Syntax

ares random kmin, kmax
ires random imin, imax
kres random kmin, kmax

Initialization

imin -- minimum range limit

imax -- maximum range limit

Performance

kmin -- minimum range limit

kmax -- maximum range limit

The random opcode is similar to linrand and trirand but sometimes I [Gabriel Maldonado] find it more convenient because allows the user to set arbitrary minimum and maximum values.

Examples

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

Example of the random opcode.
 1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
<CsoundSynthesizer>
<CsOptions>
; Select audio/midi flags here according to platform
-odac     ;;;realtime audio out
;-iadc    ;;;uncomment -iadc if RT audio input is needed too
; For Non-realtime ouput leave only the line below:
; -o random.wav -W ;;; for file output any platform
</CsOptions>
<CsInstruments>

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

instr 1 ;same values every time

krnd random 100, 1000
     printk .5, krnd                    ; look 
aout oscili 0.8, 440+krnd, 1            ; & listen
     outs aout, aout

endin

instr 2 ;different values every time

seed 0
krnd random 100, 1000                   ; seed from system clock
     printk .5, krnd                    ; look 
aout oscili 0.8, 440+krnd, 1            ; & listen
     outs aout, aout

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

i 1 0 1
i 2 2 1
e
</CsScore>
</CsoundSynthesizer>

Its output should include lines like:

i   1 time     0.00067:   894.58566
i   1 time     0.50000:   748.44281
i   1 time     1.00000:   328.29916

WARNING: Seeding from current time 1656666052

i   2 time     2.00067:   690.71466
i   2 time     2.50000:   459.42445
i   2 time     3.00000:   100.85594

See also

Random (Noise) Generators

Credits

Author: Gabriel Maldonado