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igoto

During the i-time pass only, unconditionally transfer control to the statement labeled by label.

Syntax

igoto(label)

igoto label

where label is in the same instrument block and is not an expression.

Examples

Here is an example of the igoto opcode. It uses the file igoto-modern.csd.

Example of the igoto opcode.
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<CsoundSynthesizer>
<CsOptions>
; Select audio/midi flags here according to platform
; Audio out   Audio in
-odac
-d
;           -iadc    ;;;RT audio I/O
; For Non-realtime ouput leave only the line below:
; -o igoto.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
  ; Get the value of the 4th p-field from the score.
  param:i = p4

  ; If iparam is 1 then play the high note.
  ; If not then play the low note.
  if (param == 1) igoto highnote
    igoto(lownote)

highnote:
  freq:i = 880
  goto(playit)

lownote:
  freq = 440

playit:
  ; Print the values of iparam and ifreq.
  print(param)
  print(freq)

  a1 = poscil(10000, freq)
  out(a1)
endin

</CsInstruments>
<CsScore>

; p4: 1 = high note, anything else = low note
; Play Instrument #1 for one second, a low note.
i 1 0 1 0
; Play a Instrument #1 for one second, a high note.
i 1 1 1 1
e


</CsScore>
</CsoundSynthesizer>

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

Example of the igoto opcode.
 1
 2
 3
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 5
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<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 igoto.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
  ; Get the value of the 4th p-field from the score.
  iparam = p4

  ; If iparam is 1 then play the high note.
  ; If not then play the low note.
  if (iparam == 1) igoto highnote
    igoto lownote

highnote:
  ifreq = 880
  goto playit

lownote:
  ifreq = 440
  goto playit

playit:
  ; Print the values of iparam and ifreq.
  print iparam
  print ifreq

  a1 oscil 10000, ifreq, 1
  out a1
endin


</CsInstruments>
<CsScore>

; Table #1: a simple sine wave.
f 1 0 32768 10 1

; p4: 1 = high note, anything else = low note
; Play Instrument #1 for one second, a low note.
i 1 0 1 0
; Play a Instrument #1 for one second, a high note.
i 1 1 1 1
e


</CsScore>
</CsoundSynthesizer>

Its output should include lines like this:

instr 1:  iparam = 0.000
instr 1:  ifreq = 440.000
instr 1:  iparam = 1.000
instr 1:  ifreq = 880.000

See also

Program Flow Control

Credits

Example written by Kevin Conder.