maparray — Apply a function to every element of a vector.
Apply a function of one argument to every element of a vector (one-dimensional k-rate array).
String -- a string that names an opcode function, at i-rate for maparray_i or k-rate for maparray.
Here is an example of the maparray opcode. Play maparray.csd
Example 570. Example of the maparray 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 -n </CsOptions> <CsInstruments> sr = 44100 ksmps = 32 nchnls = 2 0dbfs = 1 instr 1 ;create an array and fill with numbers kArrSrc[] fillarray 1.01, 2.02, 3.03, 4.05, 5.08, 6.13, 7.21 ;print source array printf "%s", 1, "\nSource array:\n" kndx = 0 until kndx == lenarray(kArrSrc) do printf "kArrSrc[%d] = %f\n", kndx+1, kndx, kArrSrc[kndx] kndx += 1 od ;create an empty array for the results kArrRes[] init 7 ;apply the sqrt() function to each element kArrRes maparray kArrSrc, "sqrt" ;print the result printf "%s", 1, "\nResult after applying sqrt() to source array\n" kndx = 0 until kndx == lenarray(kArrRes) do printf "kArrRes[%d] = %f\n", kndx+1, kndx, kArrRes[kndx] kndx += 1 od ;apply the log() function to each element kArrRes maparray kArrSrc, "log" ;print the result printf "%s", 1, "\nResult after applying log() to source array\n" kndx = 0 until kndx == lenarray(kArrRes) do printf "kArrRes[%d] = %f\n", kndx+1, kndx, kArrRes[kndx] kndx += 1 od ;apply the int() function to each element kArrRes maparray kArrSrc, "int" ;print the result printf "%s", 1, "\nResult after applying int() to source array\n" kndx = 0 until kndx == lenarray(kArrRes) do printf "kArrRes[%d] = %f\n", kndx+1, kndx, kArrRes[kndx] kndx += 1 od ;apply the frac() function to each element kArrRes maparray kArrSrc, "frac" ;print the result printf "%s", 1, "\nResult after applying frac() to source array\n" kndx = 0 until kndx == lenarray(kArrRes) do printf "kArrRes[%d] = %f\n", kndx+1, kndx, kArrRes[kndx] kndx += 1 od ;turn instrument instance off turnoff endin </CsInstruments> <CsScore> i 1 0 0.1 e </CsScore> </CsoundSynthesizer>