Hi,

i'm using several seeds in an instrument and would like to know why the
result of the the first value of seed A and seed B are always the same?

the csd:



; Select audio/midi flags here according to platform
-odac     ;;;realtime audio out
;-iadc    ;;;uncomment -iadc if RT audio input is needed too
; For Non-realtime ouput leave only the line below:
; -o seed.wav -W ;;; for file output any platform



sr = 48000
ksmps = 32
nchnls = 2
0dbfs  = 1

instr 1	;same values every time

seed 10
krnd randomh 100, 200, 5
     printk .5, krnd			; look 
aout oscili 0.8, 440+krnd, 1		; & listen
     outs aout, aout

endin

instr 2	;different values every time - value is derived from system clock

seed 1100					; seed from system clock
krndL randomh 100, 200, 5		
     printks2 "value A %f\n",krndL			; look 
seed 110
krndR randomh 100, 200, 5		
     printks2 "value B %f\n",  krndR		
aoutL oscili 0.8, 440+krndL, 1		
aoutR oscili 0.8, 440+krndR, 1
     outs aoutL, aoutR

endin


f 1 0 16384 10 1	;sine wave.

i 1 0 1
i 2 2 1
e




and the result:
instr 1:
 i   1 time     0.00067:   100.00000
 i   1 time     0.25067:   100.10876
 i   1 time     0.75000:   154.99278
B  0.000 ..  2.000 T  2.000 TT  2.000 M:  0.80000  0.80000
new alloc for instr 2:
value A 100.000000
value B 100.000000
value A 100.607046
value B 115.863433
value A 180.849026
value B 142.666075
value A 194.779182
value B 177.089874
value A 135.179442
value B 157.930767
B  2.000 ..  3.000 T  3.000 TT  3.000 M:  0.80000  0.80000




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Hi,

just add a fourth argument (imode) to randomh which steers the starting value

krnd randomh 100, 200, 5, 3

if you don’t set it, it always start with the lower bound. when setting it to 3 it does what you want it to do. (see manual)

cheers,

karin

> On 5 Jul 2016, at 11:12, Menno Knevel  wrote:
> 
> Hi,
> 
> i'm using several seeds in an instrument and would like to know why the
> result of the the first value of seed A and seed B are always the same?
> 
> the csd:
> 
> 
> 
> ; Select audio/midi flags here according to platform
> -odac     ;;;realtime audio out
> ;-iadc    ;;;uncomment -iadc if RT audio input is needed too
> ; For Non-realtime ouput leave only the line below:
> ; -o seed.wav -W ;;; for file output any platform
> 
> 
> 
> sr = 48000
> ksmps = 32
> nchnls = 2
> 0dbfs  = 1
> 
> instr 1	;same values every time
> 
> seed 10
> krnd randomh 100, 200, 5
>     printk .5, krnd			; look 
> aout oscili 0.8, 440+krnd, 1		; & listen
>     outs aout, aout
> 
> endin
> 
> instr 2	;different values every time - value is derived from system clock
> 
> seed 1100					; seed from system clock
> krndL randomh 100, 200, 5		
>     printks2 "value A %f\n",krndL			; look 
> seed 110
> krndR randomh 100, 200, 5		
>     printks2 "value B %f\n",  krndR		
> aoutL oscili 0.8, 440+krndL, 1		
> aoutR oscili 0.8, 440+krndR, 1
>     outs aoutL, aoutR
> 
> endin
> 
> 
> f 1 0 16384 10 1	;sine wave.
> 
> i 1 0 1
> i 2 2 1
> e
> 
> 
> 
> 
> and the result:
> instr 1:
> i   1 time     0.00067:   100.00000
> i   1 time     0.25067:   100.10876
> i   1 time     0.75000:   154.99278
> B  0.000 ..  2.000 T  2.000 TT  2.000 M:  0.80000  0.80000
> new alloc for instr 2:
> value A 100.000000
> value B 100.000000
> value A 100.607046
> value B 115.863433
> value A 180.849026
> value B 142.666075
> value A 194.779182
> value B 177.089874
> value A 135.179442
> value B 157.930767
> B  2.000 ..  3.000 T  3.000 TT  3.000 M:  0.80000  0.80000
> 
> 
> 
> 
> --
> View this message in context: http://csound.1045644.n5.nabble.com/seed-question-tp5750464.html
> Sent from the Csound - General mailing list archive at Nabble.com.
> 
> Csound mailing list
> Csound@listserv.heanet.ie
> https://listserv.heanet.ie/cgi-bin/wa?A0=CSOUND
> Send bugs reports to
>        https://github.com/csound/csound/issues
> Discussions of bugs and features can be posted here

Csound mailing list
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haha, yes you are right i didn't see that in the manual. I 've been trying
out so much different random-like opcodes that i did not notice this
parameter.
Thanks for the eye-opener.



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