Exponential distribution random number generator (positive values only). This is an x-class noise generator.
krange -- the range of the random numbers (0 - krange). Outputs only positive numbers.
For more detailed explanation of these distributions, see:
C. Dodge - T.A. Jerse 1985. Computer music. Schirmer books. pp.265 - 286
D. Lorrain. A panoply of stochastic cannons. In C. Roads, ed. 1989. Music machine . Cambridge, Massachusetts: MIT press, pp. 351 - 379.
Here is an example of the exprand opcode. It uses the files exprand.orc and exprand.sco.
Example 120. Example of the exprand opcode.
/* exprand.orc */ ; Initialize the global variables. sr = 44100 kr = 4410 ksmps = 10 nchnls = 1 ; Instrument #1. instr 1 ; Generate a random between 0 and 1. ; krange = 1 i1 exprand 1 print i1 endin /* exprand.orc */
/* exprand.sco */ ; Play Instrument #1 for one second. i 1 0 1 e /* exprand.sco */
Its output should include a line like this:
instr 1: i1 = 0.174