I think Deepak's solution is the simplest.

if you have a list like this:

f1 0 8 2 12 23 31 4 55 61 7 0

You can randomly access values like this:

k1 randh 8, 1
kval tab abs(int(k1)), 1

some like this:






;random melody

sr = 44100
kr = 4410
ksmps = 10
nchnls = 1
0dbfs = 1

instr	1

ifunction	=	2
krndmelody	randomh	1,22,8
kpitch	table	krndmelody,ifunction
a1	poscil	.6,cpspch(kpitch),1

out	a1

endin



;major
f1	0	4096	10	1

f2 0 32 -2 6.07 6.09 6.11 7.00 7.02 7.04 7.06 
              7.07 7.09 7.11 8.00 8.02 8.04 8.06 
              8.07 8.09 8.11 9.00 9.02 9.04 9.06 
              10.07 10.09 10.11 11.00 11.02 11.04 11.06 

i1	0	20



--
View this message in context: http://csound.1045644.n5.nabble.com/random-choice-in-a-list-tp5708894p5709057.html
Sent from the Csound - General mailing list archive at Nabble.com.

Yes, i've think to this solution and if no better solution, do that way, may be construct an UDO, (but i never do an udo...) but this solution appears to me to much low level (relatively ;) for a musician who just want to choose value randomly in a list.

i think an opcode for that and different choice would be a good addition.

stf

2012/5/14 Deepak <musicmagic@gmail.com>

One can probably use one of the random opcodes to create a random number and then cast it to an integer and then use it to access the table values....?

On Mon, May 14, 2012 at 7:59 AM, stephane boussuge <stfboussuge@gmail.com> wrote:

Hi,

are they an opcode for choose randomly in a list, or if not, what is the best approach for doing that ??

thanks

stf

--
www.myspace.com/dcompanymusic
www.myspace.com/thewoodshedmusicians

I teach this in the original toots, but an opcode might be nice too.

Sent from my iPhone.

On May 14, 2012, at 9:49 AM, Rory Walsh  wrote:

> I think Deepak's solution is the simplest.
> 
> if you have a list like this:
> 
> f1 0 8 2 12 23 31 4 55 61 7 0
> 
> You can randomly access values like this:
> 
> k1 randh 8, 1
> kval tab abs(int(k1)), 1
> 
> 
> Send bugs reports to the Sourceforge bug tracker
>            https://sourceforge.net/tracker/?group_id=81968&atid=564599
> Discussions of bugs and features can be posted here
> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe csound"
> 

I think a whole collection of opcode would be cool for algorithmic generation of notes, events...

something like 

random-choice (choose n element in a list)

random-serie same without repetition

also some opcodes like vector-map  -> transform anything in anything etc...

stf

2012/5/14 Deepak <musicmagic@gmail.com>

I agree with that too, because I have been using this little technique quite often, that an opcode would be really cool...

On Mon, May 14, 2012 at 10:15 AM, Dr. Richard Boulanger <rboulanger@berklee.edu> wrote:

I teach this in the original toots, but an opcode might be nice too.

Sent from my iPhone.

On May 14, 2012, at 9:49 AM, Rory Walsh <rorywalsh@ear.ie> wrote:

> I think Deepak's solution is the simplest.
>
> if you have a list like this:
>
> f1 0 8 2 12 23 31 4 55 61 7 0
>
> You can randomly access values like this:
>
> k1 randh 8, 1
> kval tab abs(int(k1)), 1
>
>
> Send bugs reports to the Sourceforge bug tracker
>            https://sourceforge.net/tracker/?group_id=81968&atid=564599
> Discussions of bugs and features can be posted here
> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe csound"
>


Send bugs reports to the Sourceforge bug tracker
           https://sourceforge.net/tracker/?group_id=81968&atid=564599
Discussions of bugs and features can be posted here
To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe csound"

--
www.myspace.com/dcompanymusic
www.myspace.com/thewoodshedmusicians

we frequently have the discussion about what to have as usual opcodes,
and what as user defined opcodes. in this case i personally am pro the
UDO solution. the way of choosing the nth element of a list is very
simple, as rory and john have shown. a udo could be like this:

  opcode RandValFromTab_i, i, i
	itab	xin
index   random    0, ftlen(itab) - 0.00001
ival      tab_i     int(index), itab
          xout        ival
  endop

for a randomly permutet table, you can use this:
http://www.csounds.com/udo/displayOpcode.php?opcode_id=91
(see the example code there)

with the new t-variables, it is even easier. so perhaps modify udo's
like these to the personal needs?

all best -

	joachim




Am 14.05.2012 16:54, schrieb stephane boussuge:
> I think a whole collection of opcode would be cool for algorithmic
> generation of notes, events...
> 
> something like 
> random-choice (choose n element in a list)
> random-serie same without repetition
> 
> also some opcodes like vector-map  -> transform anything in anything etc...
> 
> 
> stf
> 
> 
> 2012/5/14 Deepak >
> 
>     I agree with that too, because I have been using this little
>     technique quite often, that an opcode would be really cool...
> 
> 
> 
>     On Mon, May 14, 2012 at 10:15 AM, Dr. Richard Boulanger
>     > wrote:
> 
>         I teach this in the original toots, but an opcode might be nice too.
> 
>         Sent from my iPhone.
> 
>         On May 14, 2012, at 9:49 AM, Rory Walsh          > wrote:
> 
>         > I think Deepak's solution is the simplest.
>         >
>         > if you have a list like this:
>         >
>         > f1 0 8 2 12 23 31 4 55 61 7 0
>         >
>         > You can randomly access values like this:
>         >
>         > k1 randh 8, 1
>         > kval tab abs(int(k1)), 1
>         >
>         >
>         > Send bugs reports to the Sourceforge bug tracker
>         >          
>          https://sourceforge.net/tracker/?group_id=81968&atid=564599
>         
>         > Discussions of bugs and features can be posted here
>         > To unsubscribe, send email sympa@lists.bath.ac.uk
>          with body "unsubscribe csound"
>         >
> 
> 
>         Send bugs reports to the Sourceforge bug tracker
>                  
>          https://sourceforge.net/tracker/?group_id=81968&atid=564599
>         
>         Discussions of bugs and features can be posted here
>         To unsubscribe, send email sympa@lists.bath.ac.uk
>          with body "unsubscribe csound"
> 
> 
> 
> 
>     -- 
>     www.myspace.com/dcompanymusic 
>     www.myspace.com/thewoodshedmusicians
>     
> 
> 

I'm all for the UDO solution too so long as all UDOs are included in
each distribution, and are easily accessible within one's file.

Thanks Joachim, also what i ask in my primary mail is a random choice of n value in a table.
i understand we can do it by putting  you procedure of RandValFromTab in a loop, but for me, i think an opcode Random-choice would be much quicker in a production context, but we can do a UDO random-choice, i agree...

stf

Le 15 mai 2012 à 23:18, joachim heintz a écrit :

> we frequently have the discussion about what to have as usual opcodes,
> and what as user defined opcodes. in this case i personally am pro the
> UDO solution. the way of choosing the nth element of a list is very
> simple, as rory and john have shown. a udo could be like this:
> 
>  opcode RandValFromTab_i, i, i
> 	itab	xin
> index   random    0, ftlen(itab) - 0.00001
> ival      tab_i     int(index), itab
>          xout        ival
>  endop
> 
> for a randomly permutet table, you can use this:
> http://www.csounds.com/udo/displayOpcode.php?opcode_id=91
> (see the example code there)
> 
> with the new t-variables, it is even easier. so perhaps modify udo's
> like these to the personal needs?
> 
> all best -
> 
> 	joachim
> 
> 
> 
> 
> Am 14.05.2012 16:54, schrieb stephane boussuge:
>> I think a whole collection of opcode would be cool for algorithmic
>> generation of notes, events...
>> 
>> something like 
>> random-choice (choose n element in a list)
>> random-serie same without repetition
>> 
>> also some opcodes like vector-map  -> transform anything in anything etc...
>> 
>> 
>> stf
>> 
>> 
>> 2012/5/14 Deepak >
>> 
>>    I agree with that too, because I have been using this little
>>    technique quite often, that an opcode would be really cool...
>> 
>> 
>> 
>>    On Mon, May 14, 2012 at 10:15 AM, Dr. Richard Boulanger
>>    > wrote:
>> 
>>        I teach this in the original toots, but an opcode might be nice too.
>> 
>>        Sent from my iPhone.
>> 
>>        On May 14, 2012, at 9:49 AM, Rory Walsh >        > wrote:
>> 
>>> I think Deepak's solution is the simplest.
>>> 
>>> if you have a list like this:
>>> 
>>> f1 0 8 2 12 23 31 4 55 61 7 0
>>> 
>>> You can randomly access values like this:
>>> 
>>> k1 randh 8, 1
>>> kval tab abs(int(k1)), 1
>>> 
>>> 
>>> Send bugs reports to the Sourceforge bug tracker
>>> 
>>         https://sourceforge.net/tracker/?group_id=81968&atid=564599
>>        
>>> Discussions of bugs and features can be posted here
>>> To unsubscribe, send email sympa@lists.bath.ac.uk
>>         with body "unsubscribe csound"
>>> 
>> 
>> 
>>        Send bugs reports to the Sourceforge bug tracker
>> 
>>         https://sourceforge.net/tracker/?group_id=81968&atid=564599
>>        
>>        Discussions of bugs and features can be posted here
>>        To unsubscribe, send email sympa@lists.bath.ac.uk
>>         with body "unsubscribe csound"
>> 
>> 
>> 
>> 
>>    -- 
>>    www.myspace.com/dcompanymusic 
>>    www.myspace.com/thewoodshedmusicians
>>    
>> 
>> 
> 
> 
> Send bugs reports to the Sourceforge bug tracker
>            https://sourceforge.net/tracker/?group_id=81968&atid=564599
> Discussions of bugs and features can be posted here
> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe csound"
> 

I second this. A pattern system for arrays!

On 14 May 2012 15:55, stephane boussuge <stfboussuge@gmail.com> wrote:

May be also a pattern system supercollider like ???

stf

2012/5/14 stephane boussuge <stfboussuge@gmail.com>

I think a whole collection of opcode would be cool for algorithmic generation of notes, events...

something like 

random-choice (choose n element in a list)

random-serie same without repetition

also some opcodes like vector-map  -> transform anything in anything etc...

stf

2012/5/14 Deepak <musicmagic@gmail.com>

I agree with that too, because I have been using this little technique quite often, that an opcode would be really cool...

On Mon, May 14, 2012 at 10:15 AM, Dr. Richard Boulanger <rboulanger@berklee.edu> wrote:

I teach this in the original toots, but an opcode might be nice too.

Sent from my iPhone.

On May 14, 2012, at 9:49 AM, Rory Walsh <rorywalsh@ear.ie> wrote:

> I think Deepak's solution is the simplest.
>
> if you have a list like this:
>
> f1 0 8 2 12 23 31 4 55 61 7 0
>
> You can randomly access values like this:
>
> k1 randh 8, 1
> kval tab abs(int(k1)), 1
>
>
> Send bugs reports to the Sourceforge bug tracker
>            https://sourceforge.net/tracker/?group_id=81968&atid=564599
> Discussions of bugs and features can be posted here
> To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe csound"
>


Send bugs reports to the Sourceforge bug tracker
           https://sourceforge.net/tracker/?group_id=81968&atid=564599
Discussions of bugs and features can be posted here
To unsubscribe, send email sympa@lists.bath.ac.uk with body "unsubscribe csound"

--
www.myspace.com/dcompanymusic
www.myspace.com/thewoodshedmusicians

i discovered duserrnd and cuserrnd when i was making examples for the manual.
I've never worked with them since then, but perhaps they are sufficient?

Menno

--
View this message in context: http://csound.1045644.n5.nabble.com/random-choice-in-a-list-tp5708894p5710875.html
Sent from the Csound - General mailing list archive at Nabble.com.