lenarray — Evaluates the size or shape length of an array.
karray -- The array that is being questioned. It can be of any dimension.
iwhich -- selects which dimension to evaluate the size. If zero or negative it selects the number of dimensions. It defaults to 1, as used in a vector.
kr -- length of vector.
karray -- array to query.
If the dimension requested is larger than the actual array, or the array is not initialised the value -1 is returned.
Here is an example of the lenarray opcode. It uses the file lenarray.csd.
Example 498. Example of the lenarray opcode.
See the sections Real-time Audio and Command Line Flags for more information on using command line flags.
<CsoundSynthesizer> <CsOptions> -n -m128 ;no sound output, reduced messages </CsOptions> <CsInstruments> ;example by joachim heintz sr = 44100 ksmps = 32 nchnls = 1 0dbfs = 1 instr 1 ;simple example kArr[] fillarray 1, 2, 3, 4 ;fill array manually printks "Length of kArr = %d\n\n", 0, lenarray(kArr) ;print out its length turnoff ;only do this in the first k-cycle endin instr 2 ;random array length iNumEls random 1, 11 ;create random number between 1 and 10 kArr[] init int(iNumEls) ;create array of this length printks "Random length of kArr = %d\n", 0, lenarray(kArr) ;print out turnoff endin instr 3 ;fill random array length with random elements iNumEls random 1, 11 ;create random number between 1 and 10 kArr[] init int(iNumEls) ;create array of this length printks "Random length of kArr = %d\n", 0, lenarray(kArr) ;print out ;fill kIndx = 0 ;initialize index until kIndx == lenarray(kArr) do kArr[kIndx] rnd31 10, 0 ;set element to random value -10...10 kIndx += 1 ;increase index od ;print kIndx = 0 ;initialize index until kIndx == lenarray(kArr) do printf("kArr[%d] = %f\n", kIndx+1, kIndx, kArr[kIndx]) kIndx += 1 ;increase index od turnoff endin </CsInstruments> <CsScore> i 1 0 .1 i 2 0 .1 i 2 0 .1 i 3 0 .1 </CsScore> </CsoundSynthesizer>