The Alternative Csound Reference Manual
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# log

log -- Returns a natural log.

## Description

Returns the natural log of x (x positive only).

The argument value is restricted for log, log10, and sqrt.

## Syntax

log(x) (no rate restriction)

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.

## Examples

Here is an example of the log opcode. It uses the files log.orc and log.sco.

Example 1. Example of the log opcode.

    /* log.orc */
    ; Initialize the global variables.
    sr = 44100
    kr = 4410
    ksmps = 10
    nchnls = 1

    ; Instrument #1.
    instr 1
      i1 = log(8)
      print i1
    endin
    /* log.orc */

    /* log.sco */
    ; Play Instrument #1 for one second.
    i 1 0 1
    e
    /* log.sco */

Its output should include a line like this:

    instr 1:  i1 = 2.079

## See Also

abs, exp, frac, int, log10, i, sqrt

## Credits

Example written by Kevin Conder.

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