qnan
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## qnan

qnan — Questions whether the argument is not a number

## Description

Returns the number of times the argument is not a number.

## Syntax

    qnan(x) (no rate restriction)

## Examples

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

Example 868. Example of the qnan opcode.

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

    <CsoundSynthesizer>
    <CsOptions>
    -+rtaudio=alsa -o dac:hw:0
    </CsOptions>
    <CsInstruments>
    nchnls = 2
    ksmps = 400

    #define WII_B           #3#
    #define WII_A           #4#
    #define WII_R_A         #304#
    #define WII_PITCH       #20#
    #define WII_ROLL        #21#

    gkcnt init 1

    instr 1
      i1  wiiconnect 3,1

          wiirange   $WII_PITCH., -20, 0
      kt  wiidata    $WII_B.
      ka  wiidata    $WII_A.
      kra wiidata    $WII_R_A.
      gka wiidata    $WII_PITCH.
      gkp wiidata    $WII_ROLL.
    ; If the B (trigger) button is pressed then activate a note
      if  (kt==0)    goto ee
      if (qnan(gka)) goto ee
      if (qnan(gkp)) goto ee
      event "i", 2, 0, 5
      gkcnt = gkcnt + 1
      printk2  kb
    endin

    instr 2
      a1 oscil  ampdbfs(gka), 440+gkp, 1
         outs   a1, a1
    endin

    </CsInstruments>

    <CsScore>
    f1 0 4096 10 1
    i1 0 300

    </CsScore>

    </CsoundSynthesizer>

## See also

Mathematical Functions

## Credits

Written by John ffitch.

New in Csound 5.14

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