log2 — Returns a base 2 log.


Returns the base 2 log of x (x positive only).

The argument value is restricted for log, log2, and sqrt.


log2(x) (no rate
log2(k/i[]) (k- or i-arrays )

where the argument within the parentheses may be an expression. Value converters perform arithmetic translation from units of one kind to units of another. The result can then be a term in a further expression.


Here is an example of the log2 opcode. It uses the file log2.csd.

Example 542. Example of the log2 opcode.

See the sections Real-time Audio and Command Line Flags for more information on using command line flags.

; 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 log10.wav -W ;;; for file output any platform

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

; Instrument #1.
instr 1
  i1 = log2(8)
  print i1


; Play Instrument #1 for one second.
i 1 0 1


Its output should include a line like this:

instr 1:  i1 = 3.000

See also

Mathematical Functions


Written by John ffitch.

New in version 5.17.12