vaset
vaset — Write value of into the current buffer of an a-rate variable by index.
Description
Write values into the current buffer of an a-rate variable at the given index. Useful for doing sample-by-sample manipulation at k-rate without using setksmps 1.
![[Note]](images/note.png)
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Note |
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Because this opcode does not do any bounds checking, the user must be careful not to try to write values past ksmps (the size of a buffer for an a-rate variable) by using index values greater than ksmps. |
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In Csound6 this opcode does do bounds checking. |
Performance
kval - value to write into avar
kndx - index of the sample to write to the current buffer of the given avar variable
avar - a-rate variable to write to
Examples
Here is an example of the vaset opcode. It uses the file vaset.csd.
Example 971. Example of the vaset 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 No messages -odac -iadc -d ;;;RT audio I/O ; For Non-realtime ouput leave only the line below: ; -o avarset.wav -W ;;; for file output any platform </CsOptions> <CsInstruments> sr=44100 ksmps=1 nchnls=2 instr 1 ; Sine Wave ifreq = (p4 > 15 ? p4 : cpspch(p4)) iamp = ampdb(p5) kenv adsr 0.1, 0.05, .9, 0.2 aout init 0 ksampnum init 0 kcount = 0 iperiod = sr / ifreq i2pi = 3.14159 * 2 loopStart: kphase = (ksampnum % iperiod) / iperiod knewval = sin(kphase * i2pi) vaset knewval, kcount,aout ksampnum = ksampnum + 1 loop_lt kcount, 1, ksmps, loopStart aout = aout * iamp * kenv outs aout, aout endin </CsInstruments> <CsScore> i1 0.0 2 440 80 e </CsScore> </CsoundSynthesizer>