r Statement (Repeat Statement)
r — Starts a repeated section.
Initialization
p1 -- Number of times to repeat the section.
p2 -- Macro(name) to advance with each repetition (optional).
Performance
In order that the sections may be more flexible than simple editing, the macro named p2 is given the value of 1 for the first time through the section, 2 for the second, and 3 for the third. This can be used to change p-field parameters, or ignored.
![[Warning]](images/warning.png)
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Warning |
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Because of serious problems of interaction with macro expansion, sections must start and end in the same file, and not in a macro. |
Examples
Here is an example of the r statement. Play r.csd
Example 1267. Example of the r statement.
<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 r.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 ; The score's p4 parameter has the number of repeats. kreps = p4 ; The score's p5 parameter has our note's frequency. kcps = p5 ; Print the number of repeats. printks "Repeated %i time(s).\\n", 1, kreps ; Generate a nice beep. a1 oscil 20000, kcps, 1 out a1 endin </CsInstruments> <CsScore> ; Table #1, a sine wave. f 1 0 16384 10 1 ; We'll repeat this section 6 times. Each time it ; is repeated, its macro REPS_MACRO is incremented. r6 REPS_MACRO ; Play Instrument #1. ; p4 = the r statement's macro, REPS_MACRO. ; p5 = the frequency in cycles per second. i 1 00.10 00.10 $REPS_MACRO 1760 i 1 00.30 00.10 $REPS_MACRO 880 i 1 00.50 00.10 $REPS_MACRO 440 i 1 00.70 00.10 $REPS_MACRO 220 ; Marks the end of the section. s e </CsScore> </CsoundSynthesizer>