if
if — Branches conditionally at initialization or during performance time.
Description
if...igoto -- conditional branch at initialization time, depending on the truth value of the logical expression ia R ib. The branch is taken only if the result is true.
if...kgoto -- conditional branch during performance time, depending on the truth value of the logical expression ka R kb. The branch is taken only if the result is true.
if...goto -- combination of the above. Condition tested on every pass.
if...then -- allows the ability to specify conditional if/else/endif blocks. All if...then blocks must end with an endif statement. elseif and else statements are optional. Any number of elseif statements are allowed. Only one else statement may occur and it must be the last conditional statement before the endif statement. Nested if...then blocks are allowed.
![[Note]](images/note.png)
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Note that if the condition uses a k-rate variable (for instance, “if kval > 0”), the if...goto or if...then statement will be ignored during the i-time pass. This allows for opcode initialization, even if the k-rate variable has already been assigned an appropriate value by an earlier init statement. |
Syntax
if ia R ib igoto label
if ka R kb kgoto label
if xa R xb goto label
if xa R xb then
where label is in the same instrument block and is not an expression, and where R is one of the Relational operators (<, =, <=, ==, !=) (and = for convenience, see also under Conditional Values).
If goto or then is used instead of kgoto or igoto, the behavior is determined by the type being compared. If the comparison used k-type variables, kgoto is used and viceversa.
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If/then/goto statements cannot do audio-type comparisons. You cannot put a-type variables in the comparison expressions for these opcodes. The reason for this is that audio variables are actually vectors, which cannot be compared in the same way as scalars. If you need to compare individua audio samples, use kr = 1 or Comparators |
Examples
Here is an example of the if...igoto combination. It uses the file igoto.csd.
Example 452. Example of the if...igoto combination.
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 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
Here is an example of the if...kgoto combination. It uses the file kgoto.csd.
Example 453. Example of the if...kgoto combination.
<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 kgoto.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 ; Change kval linearly from 0 to 2 over ; the period set by the third p-field. kval line 0, p3, 2 ; If kval is greater than or equal to 1 then play the high note. ; If not then play the low note. if (kval >= 1) kgoto highnote kgoto lownote highnote: kfreq = 880 goto playit lownote: kfreq = 440 goto playit playit: ; Print the values of kval and kfreq. printks "kval = %f, kfreq = %f\\n", 1, kval, kfreq a1 oscil 10000, kfreq, 1 out a1 endin </CsInstruments> <CsScore> ; Table #1: a simple sine wave. f 1 0 32768 10 1 ; Play Instrument #1 for two seconds. i 1 0 2 e </CsScore> </CsoundSynthesizer>
Its output should include lines like this:
kval = 0.000000, kfreq = 440.000000 kval = 0.999732, kfreq = 440.000000 kval = 1.999639, kfreq = 880.000000
Examples
Here is an example of the if...then combo. It uses the file ifthen.csd.
Example 454. Example of the if...then combo.
<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 ifthen.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> sr = 44100 kr = 4410 ksmps = 10 nchnls = 1 ; Instrument #1. instr 1 ; Get the note value from the fourth p-field. knote = p4 ; Does the user want a low note? if (knote == 0) then kcps = 220 ; Does the user want a middle note? elseif (knote == 1) then kcps = 440 ; Does the user want a high note? elseif (knote == 2) then kcps = 880 endif ; Create the note. kamp init 25000 ifn = 1 a1 oscili kamp, kcps, ifn out a1 endin </CsInstruments> <CsScore> ; Table #1, a sine wave. f 1 0 16384 10 1 ; p4: 0=low note, 1=middle note, 2=high note. ; Play Instrument #1 for one second, low note. i 1 0 1 0 ; Play Instrument #1 for one second, middle note. i 1 1 1 1 ; Play Instrument #1 for one second, high note. i 1 2 1 2 e </CsScore> </CsoundSynthesizer>