pindex

pindex — Returns the value of a specified pfield.

Description

pindex returns the value of a specified pfield.

Syntax

ivalue pindex ipfieldIndex

Initialization

ipfieldIndex - pfield number to query.

ivalue - value of the pfield.

Examples

Here is an example of the pindex opcode. It uses the file pindex.csd.

Example 606. Example of the pindex 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  MIDI in
-odac           -iadc    ; -d         -M0  ;;;RT audio I/O with MIDI in
; For Non-realtime ouput leave only the line below:
;-o pindex.wav -W ;;; for file output any platform
</CsOptions>
<CsInstruments>
;Example by Anthony Kozar Dec 2006

instr 1
    inum    pcount
    index   init 1
    loop1:
        ivalue pindex index
        printf_i "p%d = %f\n", 1, index, ivalue
        index   = index + 1
    if  (index <= inum) igoto loop1
    print inum
endin

</CsInstruments>
<CsScore>
i1  0 3 40 50         ; has 5 pfields
i1  1 2 80            ; has 5 due to carry
i1  2 1 40 50 60 70   ; has 7
e
</CsScore>
</CsoundSynthesizer>


The example will produce the following output:

new alloc for instr 1:
WARNING: instr 1 uses 3 p-fields but is given 5
p1 = 1.000000
p2 = 0.000000
p3 = 3.000000
p4 = 40.000000
p5 = 50.000000
instr 1:  inum = 5.000
B  0.000 ..  1.000 T  1.000 TT  1.000 M:      0.0
new alloc for instr 1:
WARNING: instr 1 uses 3 p-fields but is given 5
p1 = 1.000000
p2 = 1.000000
p3 = 2.000000
p4 = 80.000000
p5 = 50.000000
instr 1:  inum = 5.000
B  1.000 ..  2.000 T  2.000 TT  2.000 M:      0.0
new alloc for instr 1:
WARNING: instr 1 uses 3 p-fields but is given 7
p1 = 1.000000
p2 = 2.000000
p3 = 1.000000
p4 = 40.000000
p5 = 50.000000
p6 = 60.000000
p7 = 70.000000
instr 1:  inum = 7.000
      

The warnings can be ignored, because the pfields are used indirectly through pindex instead of explicitly through p4, p5, etc.

Here is another example of the pindex opcode. It uses the file pindex-2.csd.

Example 607. Second example of the pindex opcode.

<CsoundSynthesizer>
<CsOptions>
; Select audio/midi flags here according to platform
-odac  ;;;realtime audio
;-iadc    ;;;uncomment -iadc if realtime audio input is needed too
; For Non-realtime ouput leave only the line below:
; -o pindex-2.wav -W ;;; for file output any platform
</CsOptions>
<CsInstruments>

sr = 44100
ksmps = 32
nchnls = 2
0dbfs  = 1

; This UDO returns a pfield value but returns 0 if it does not exist.
opcode  mypvalue, i, i
	index  xin
	inum   pcount
	if	  (index > inum)  then
		iout = 0.0
	else
		iout pindex index
	endif
	
	xout	iout
endop
	
; Envelope UDO that reads parameters from a flexible number of pfields
; Syntax:   kenv  flexlinseg  ipstart
;           ipstart is the first pfield of the envelope
;               parameters.  Reads remaining pfields (up to 21 of them).
;           kenv is the output envelope.

opcode  flexlinseg, k, i
	ipstart xin
	
	iep1   mypvalue	ipstart
	iep2   mypvalue	ipstart + 1
	iep3   mypvalue	ipstart + 2
	iep4   mypvalue	ipstart + 3
	iep5   mypvalue	ipstart + 4
	iep6   mypvalue	ipstart + 5
	iep7   mypvalue	ipstart + 6
	iep8   mypvalue	ipstart + 7
	iep9   mypvalue	ipstart + 8
	iepa   mypvalue	ipstart + 9
	iepb   mypvalue	ipstart + 10
	iepc   mypvalue	ipstart + 11
	iepd   mypvalue	ipstart + 12
	iepe   mypvalue	ipstart + 13
	iepf   mypvalue	ipstart + 14
	iepg   mypvalue	ipstart + 15
	ieph   mypvalue	ipstart + 16
	iepi   mypvalue	ipstart + 17
	iepj   mypvalue	ipstart + 18
	iepk   mypvalue	ipstart + 19
	iepl   mypvalue	ipstart + 20

	kenv   linseg	 iep1, iep2, iep3, iep4, iep5, iep6, iep7, iep8, \
	                   iep9, iepa, iepb, iepc, iepd, iepe, iepf, iepg, \
	                   ieph, iepi, iepj, iepk, iepl	
	xout   kenv
endop
	
instr 1
; This instrument only requires 3 pfields but can accept up to 24.
; (You will still get warnings about more than 3).	
kenv flexlinseg  4		; envelope params start at p4
aout oscili kenv*.5, 256, 1
     outs aout, aout

endin
</CsInstruments>
<CsScore>
f1  0 8192 10 1

i1  0 2  0.0 1.0 1.0 1.0 0.0
i1  2 2  0.0 0.1 1.0 1.0 1.0 0.1 0.0
i1  4 2  0.0 0.5 0.0	  			; one problem is that "missing" pfields carry
i1  6 2  0.0 0.5 0.0 !	  			; now we can fix this problem with !
i1  8 10  0.0  3.0 1.0  0.3 0.1  0.3 1.0  0.3 0.1  0.3 1.0  0.3 0.1  0.8 0.9  5.0 0.0

e
</CsScore>
</CsoundSynthesizer>


The example will produce the following output:

WARNING: instr 1 uses 3 p-fields but is given 8
B  0.000 ..  2.000 T  2.000 TT  2.000 M:  0.49966  0.49966
WARNING: instr 1 uses 3 p-fields but is given 10
B  2.000 ..  4.000 T  4.000 TT  4.000 M:  0.50000  0.50000
WARNING: instr 1 uses 3 p-fields but is given 10
B  4.000 ..  6.000 T  6.000 TT  6.000 M:  0.49943  0.49943
WARNING: instr 1 uses 3 p-fields but is given 6
B  6.000 ..  8.000 T  8.000 TT  8.000 M:  0.00000  0.00000
WARNING: instr 1 uses 3 p-fields but is given 20
B  8.000 .. 18.000 T 18.000 TT 18.000 M:  0.49994  0.49994
      

See Also

pcount

Credits

Example by: Anthony Kozar

Dec. 2006