taninv2
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## taninv2

taninv2 — Returns an arctangent.

## Description

Returns the arctangent of iy/ix, ky/kx, or ay/ax.

## Syntax

    ares taninv2 ay, ax

    ires taninv2 iy, ix

    kres taninv2 ky, kx

Returns the arctangent of iy/ix, ky/kx, or ay/ax. If y is zero, taninv2 returns zero regardless of the value of x. If x is zero, the return value is:

- π/2, if y is positive.

- -π/2, if y is negative.

- 0, if y is 0.

## Initialization

iy, ix -- values to be converted

## Performance

ky, kx -- control rate signals to be converted

ay, ax -- audio rate signals to be converted

## Examples

Here is an example of the taninv2 opcode. It uses the file taninv2.csd.

Example 829. Example of the taninv2 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
    ; For Non-realtime ouput leave only the line below:
    ; -o taninv2.wav -W ;;; for file output any platform
    </CsOptions>
    <CsInstruments>

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

    ; Instrument #1.
    instr 1
      ; Returns the arctangent for 1/2.
      i1 taninv2 1, 2

      print i1
    endin

    </CsInstruments>
    <CsScore>

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

    </CsScore>
    </CsoundSynthesizer>

Its output should include a line like this:

    instr 1:  i1 = 0.464

## See Also

taninv

## Credits

Author: John ffitch
University of Bath/Codemist Ltd.
Bath, UK
April 1998

Example written by Kevin Conder.

New in Csound version 3.48

Corrected on May 2002, thanks to Istvan Varga.

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