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Maximum Value in ftables
by joachim heintz
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Hello all -
is there an opcode to get the maximum value of a function table? E.g. for the table giTab ftgen 0, 0, 8, -2, 1, 5, 2, -4, -9, 8, 0, 4 it should return 8. Thanks - joachim Send bugs reports to this list. To unsubscribe, send email sympa@... with body "unsubscribe csound" |
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Re: Maximum Value in ftables
by David Akbari
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Hi,
This is preallocated for speed, and you may think of something better. What you might try is setting it up the table indexing using the looping opcodes inside of a UDO space. This implementation is reading each point individually, of course with 8 points in the table it's not such a problem but it will quickly prove inadequate with larger sized tables. I tried reading the table using the phasor to index it over time, but the results are not fast and if your ultimate implementation requires you to get the values "now" for realtime performance, this may not do. The extra bonus in here to answer your question is the use of Anthony Kozar's "max" opcode. <CsoundSynthesizer> <CsOptions> -m0 -odac -iadc -d -b128 -B256 -Mhw:2,0 -+rtaudio=alsa -+rtmidi=null </CsOptions> <CsInstruments> sr = 44100 ksmps = 128 nchnls = 2 giTab ftgen 1, 0, 8, -2, 1, 5, 2, -4, -9, 8, 0, 4 /*--- ---*/ instr 1 ;kndx1 phasor 1/(ftlen(1)) ;kndx1 = kndx1 * ftlen(1) ktab1 table 1, 1 ktab2 table 2, 1 ktab3 table 3, 1 ktab4 table 4, 1 ktab5 table 5, 1 ktab6 table 6, 1 ktab7 table 7, 1 ktab8 table 8, 1 kmax max ktab1, ktab2, ktab3, ktab4, ktab5, ktab6, ktab7, ktab8 printk2 kmax endin /*--- ---*/ </CsInstruments> <CsScore> i1 0 100 </CsScore> </CsoundSynthesizer> On Sun, Jul 6, 2008 at 1:58 PM, joachim heintz <jh@...> wrote: > Hello all - > > is there an opcode to get the maximum value of a function table? E.g. for > the table > giTab ftgen 0, 0, 8, -2, 1, 5, 2, -4, -9, 8, 0, 4 > it should return 8. > > Thanks - > > joachim > Send bugs reports to this list. To unsubscribe, send email sympa@... with body "unsubscribe csound" |
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Re: Re: Maximum Value in ftables
by Steven Yi
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I'd say try using a loop; there's code with this ftreverse UDO to start with:
http://www.csounds.com/udo/displayOpcode.php?opcode_id=78 Mixing the loop with David's code should yield something reusable. =) On Sun, Jul 6, 2008 at 12:27 PM, David Akbari <dakbari@...> wrote: > Hi, > > This is preallocated for speed, and you may think of something better. > What you might try is setting it up the table indexing using the > looping opcodes inside of a UDO space. This implementation is reading > each point individually, of course with 8 points in the table it's not > such a problem but it will quickly prove inadequate with larger sized > tables. I tried reading the table using the phasor to index it over > time, but the results are not fast and if your ultimate implementation > requires you to get the values "now" for realtime performance, this > may not do. The extra bonus in here to answer your question is the use > of Anthony Kozar's "max" opcode. > > <CsoundSynthesizer> > <CsOptions> > -m0 -odac -iadc -d -b128 -B256 -Mhw:2,0 -+rtaudio=alsa -+rtmidi=null > </CsOptions> > <CsInstruments> > > sr = 44100 > ksmps = 128 > nchnls = 2 > > giTab ftgen 1, 0, 8, -2, 1, 5, 2, -4, -9, 8, 0, 4 > > /*--- ---*/ > > instr 1 > ;kndx1 phasor 1/(ftlen(1)) > ;kndx1 = kndx1 * ftlen(1) > > ktab1 table 1, 1 > ktab2 table 2, 1 > ktab3 table 3, 1 > ktab4 table 4, 1 > ktab5 table 5, 1 > ktab6 table 6, 1 > ktab7 table 7, 1 > ktab8 table 8, 1 > > kmax max ktab1, ktab2, ktab3, ktab4, ktab5, ktab6, ktab7, ktab8 > > printk2 kmax > > endin > > /*--- ---*/ > </CsInstruments> > <CsScore> > i1 0 100 > > </CsScore> > </CsoundSynthesizer> > > On Sun, Jul 6, 2008 at 1:58 PM, joachim heintz <jh@...> wrote: >> Hello all - >> >> is there an opcode to get the maximum value of a function table? E.g. for >> the table >> giTab ftgen 0, 0, 8, -2, 1, 5, 2, -4, -9, 8, 0, 4 >> it should return 8. >> >> Thanks - >> >> joachim >> > > > Send bugs reports to this list. > To unsubscribe, send email sympa@... with body "unsubscribe csound" > Send bugs reports to this list. To unsubscribe, send email sympa@... with body "unsubscribe csound" |
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Re: Maximum Value in ftables
by Mark Van Peteghem-2
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I would like to add that in your example it should return a little less
than one, because the table is normalized. The maximum absolute value is 9, so everything would be divided by 9. joachim heintz schreef: > Hello all - > > is there an opcode to get the maximum value of a function table? E.g. > for the table > giTab ftgen 0, 0, 8, -2, 1, 5, 2, -4, -9, 8, 0, 4 > it should return 8. > > Thanks - > > joachim > > > Send bugs reports to this list. > To unsubscribe, send email sympa@... with body > "unsubscribe csound" > > -- Mark _________________________________________ When you get lemons, you make lemonade. When you get hardware, you make software. Send bugs reports to this list. To unsubscribe, send email sympa@... with body "unsubscribe csound" |
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Re: Re: Maximum Value in ftables
by Mike Moser-Booth
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Actually, it would not be normalized because the Gen number is negative.
Mark Van Peteghem wrote: > I would like to add that in your example it should return a little > less than one, because the table is normalized. The maximum absolute > value is 9, so everything would be divided by 9. > > joachim heintz schreef: >> Hello all - >> >> is there an opcode to get the maximum value of a function table? E.g. >> for the table >> giTab ftgen 0, 0, 8, -2, 1, 5, 2, -4, -9, 8, 0, 4 >> it should return 8. >> >> Thanks - >> >> joachim >> >> >> Send bugs reports to this list. >> To unsubscribe, send email sympa@... with body >> "unsubscribe csound" >> >> > Send bugs reports to this list. To unsubscribe, send email sympa@... with body "unsubscribe csound" |
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Re: Re: Re: Maximum Value in ftables
by Mark Van Peteghem-2
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Ah, I mislooked, I thought 8 was the GEN number.
Mike Moser-Booth schreef: > Actually, it would not be normalized because the Gen number is negative. > > Mark Van Peteghem wrote: >> I would like to add that in your example it should return a little >> less than one, because the table is normalized. The maximum absolute >> value is 9, so everything would be divided by 9. >> >> joachim heintz schreef: >>> Hello all - >>> >>> is there an opcode to get the maximum value of a function table? >>> E.g. for the table >>> giTab ftgen 0, 0, 8, -2, 1, 5, 2, -4, -9, 8, 0, 4 >>> it should return 8. >>> >>> Thanks - >>> >>> joachim >>> >>> >>> Send bugs reports to this list. >>> To unsubscribe, send email sympa@... with body >>> "unsubscribe csound" >>> >>> >> > > > > Send bugs reports to this list. > To unsubscribe, send email sympa@... with body > "unsubscribe csound" > > -- Mark _________________________________________ When you get lemons, you make lemonade. When you get hardware, you make software. Send bugs reports to this list. To unsubscribe, send email sympa@... with body "unsubscribe csound" |
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Re: Re: Re: Maximum Value in ftables
by joachim heintz
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Thanks to all for the suggestions. I'm just wondering the following:
Each time csound displays a function table, it gives a message like "ftable 121: 16 points, max 2.670". So csound knows the maximum value. I think it would be useful to have an access to this value with an opcode like this imax ftmax ifn (Like ftlen, ftsr and so on.) What do you, Steven, and the other developers think about this? joachim Am 06.07.2008 um 21:49 schrieb Steven Yi: > I'd say try using a loop; there's code with this ftreverse UDO to > start with: > > http://www.csounds.com/udo/displayOpcode.php?opcode_id=78 > > Mixing the loop with David's code should yield something reusable. =) > > On Sun, Jul 6, 2008 at 12:27 PM, David Akbari <dakbari@...> > wrote: >> Hi, >> >> This is preallocated for speed, and you may think of something >> better. >> What you might try is setting it up the table indexing using the >> looping opcodes inside of a UDO space. This implementation is reading >> each point individually, of course with 8 points in the table it's >> not >> such a problem but it will quickly prove inadequate with larger sized >> tables. I tried reading the table using the phasor to index it over >> time, but the results are not fast and if your ultimate >> implementation >> requires you to get the values "now" for realtime performance, this >> may not do. The extra bonus in here to answer your question is the >> use >> of Anthony Kozar's "max" opcode. >> >> <CsoundSynthesizer> >> <CsOptions> >> -m0 -odac -iadc -d -b128 -B256 -Mhw:2,0 -+rtaudio=alsa -+rtmidi=null >> </CsOptions> >> <CsInstruments> >> >> sr = 44100 >> ksmps = 128 >> nchnls = 2 >> >> giTab ftgen 1, 0, 8, -2, 1, 5, 2, -4, -9, 8, 0, 4 >> >> /*--- ---*/ >> >> instr 1 >> ;kndx1 phasor 1/(ftlen(1)) >> ;kndx1 = kndx1 * ftlen(1) >> >> ktab1 table 1, 1 >> ktab2 table 2, 1 >> ktab3 table 3, 1 >> ktab4 table 4, 1 >> ktab5 table 5, 1 >> ktab6 table 6, 1 >> ktab7 table 7, 1 >> ktab8 table 8, 1 >> >> kmax max ktab1, ktab2, ktab3, ktab4, ktab5, ktab6, ktab7, >> ktab8 >> >> printk2 kmax >> >> endin >> >> /*--- ---*/ >> </CsInstruments> >> <CsScore> >> i1 0 100 >> >> </CsScore> >> </CsoundSynthesizer> >> >> On Sun, Jul 6, 2008 at 1:58 PM, joachim heintz >> <jh@...> wrote: >>> Hello all - >>> >>> is there an opcode to get the maximum value of a function table? >>> E.g. for >>> the table >>> giTab ftgen 0, 0, 8, -2, 1, 5, 2, -4, -9, 8, 0, 4 >>> it should return 8. >>> >>> Thanks - >>> >>> joachim >>> >> >> >> Send bugs reports to this list. >> To unsubscribe, send email sympa@... with body >> "unsubscribe csound" >> > > > Send bugs reports to this list. > To unsubscribe, send email sympa@... with body > "unsubscribe csound" Send bugs reports to this list. To unsubscribe, send email sympa@... with body "unsubscribe csound" |
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Re: Re: Re: Re: Maximum Value in ftables
by Steven Yi
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Hi Joachim,
Following what I mentioned earlier, here's code for a UDO that will do what are asking about: opcode ftmax,i,i itablenum xin ilen = ftlen(itablenum) imax table 0, itablenum icount = 1 loopStart: itemp table icount, itablenum imax = (itemp > imax) ? itemp : imax icount = icount + 1 if (icount < ilen) goto loopStart xout imax endop steven On Mon, Jul 7, 2008 at 12:22 PM, joachim heintz <jh@...> wrote: > Thanks to all for the suggestions. I'm just wondering the following: > Each time csound displays a function table, it gives a message like > "ftable 121: 16 points, max 2.670". > So csound knows the maximum value. > I think it would be useful to have an access to this value with an opcode > like this > > imax ftmax ifn > > (Like ftlen, ftsr and so on.) > > What do you, Steven, and the other developers think about this? > > joachim > > > > Am 06.07.2008 um 21:49 schrieb Steven Yi: > >> I'd say try using a loop; there's code with this ftreverse UDO to start >> with: >> >> http://www.csounds.com/udo/displayOpcode.php?opcode_id=78 >> >> Mixing the loop with David's code should yield something reusable. =) >> >> On Sun, Jul 6, 2008 at 12:27 PM, David Akbari <dakbari@...> wrote: >>> >>> Hi, >>> >>> This is preallocated for speed, and you may think of something better. >>> What you might try is setting it up the table indexing using the >>> looping opcodes inside of a UDO space. This implementation is reading >>> each point individually, of course with 8 points in the table it's not >>> such a problem but it will quickly prove inadequate with larger sized >>> tables. I tried reading the table using the phasor to index it over >>> time, but the results are not fast and if your ultimate implementation >>> requires you to get the values "now" for realtime performance, this >>> may not do. The extra bonus in here to answer your question is the use >>> of Anthony Kozar's "max" opcode. >>> >>> <CsoundSynthesizer> >>> <CsOptions> >>> -m0 -odac -iadc -d -b128 -B256 -Mhw:2,0 -+rtaudio=alsa -+rtmidi=null >>> </CsOptions> >>> <CsInstruments> >>> >>> sr = 44100 >>> ksmps = 128 >>> nchnls = 2 >>> >>> giTab ftgen 1, 0, 8, -2, 1, 5, 2, -4, -9, 8, 0, 4 >>> >>> /*--- ---*/ >>> >>> instr 1 >>> ;kndx1 phasor 1/(ftlen(1)) >>> ;kndx1 = kndx1 * ftlen(1) >>> >>> ktab1 table 1, 1 >>> ktab2 table 2, 1 >>> ktab3 table 3, 1 >>> ktab4 table 4, 1 >>> ktab5 table 5, 1 >>> ktab6 table 6, 1 >>> ktab7 table 7, 1 >>> ktab8 table 8, 1 >>> >>> kmax max ktab1, ktab2, ktab3, ktab4, ktab5, ktab6, ktab7, ktab8 >>> >>> printk2 kmax >>> >>> endin >>> >>> /*--- ---*/ >>> </CsInstruments> >>> <CsScore> >>> i1 0 100 >>> >>> </CsScore> >>> </CsoundSynthesizer> >>> >>> On Sun, Jul 6, 2008 at 1:58 PM, joachim heintz <jh@...> >>> wrote: >>>> >>>> Hello all - >>>> >>>> is there an opcode to get the maximum value of a function table? E.g. >>>> for >>>> the table >>>> giTab ftgen 0, 0, 8, -2, 1, 5, 2, -4, -9, 8, 0, 4 >>>> it should return 8. >>>> >>>> Thanks - >>>> >>>> joachim >>>> >>> >>> >>> Send bugs reports to this list. >>> To unsubscribe, send email sympa@... with body "unsubscribe >>> csound" >>> >> >> >> Send bugs reports to this list. >> To unsubscribe, send email sympa@... with body "unsubscribe >> csound" > > > > Send bugs reports to this list. > To unsubscribe, send email sympa@... with body "unsubscribe > csound" > Send bugs reports to this list. To unsubscribe, send email sympa@... with body "unsubscribe csound" |
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Re: Re: Re: Re: Re: Maximum Value in ftables
by joachim heintz
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Thanks, Steven. Very elegant solution.
In my opinion, the question remains: Why doing something again, what csound obviously already has, and prints out when displaying a function table? Thanks again and best regards - joachim Am 07.07.2008 um 21:53 schrieb Steven Yi: > Hi Joachim, > > Following what I mentioned earlier, here's code for a UDO that will do > what are asking about: > > opcode ftmax,i,i > > itablenum xin > > ilen = ftlen(itablenum) > > imax table 0, itablenum > > icount = 1 > > loopStart: > > itemp table icount, itablenum > > imax = (itemp > imax) ? itemp : imax > > icount = icount + 1 > > if (icount < ilen) goto loopStart > > xout imax > > endop > > steven > > On Mon, Jul 7, 2008 at 12:22 PM, joachim heintz > <jh@...> wrote: >> Thanks to all for the suggestions. I'm just wondering the following: >> Each time csound displays a function table, it gives a message like >> "ftable 121: 16 points, max 2.670". >> So csound knows the maximum value. >> I think it would be useful to have an access to this value with an >> opcode >> like this >> >> imax ftmax ifn >> >> (Like ftlen, ftsr and so on.) >> >> What do you, Steven, and the other developers think about this? >> >> joachim >> >> >> >> Am 06.07.2008 um 21:49 schrieb Steven Yi: >> >>> I'd say try using a loop; there's code with this ftreverse UDO to >>> start >>> with: >>> >>> http://www.csounds.com/udo/displayOpcode.php?opcode_id=78 >>> >>> Mixing the loop with David's code should yield something >>> reusable. =) >>> >>> On Sun, Jul 6, 2008 at 12:27 PM, David Akbari <dakbari@...> >>> wrote: >>>> >>>> Hi, >>>> >>>> This is preallocated for speed, and you may think of something >>>> better. >>>> What you might try is setting it up the table indexing using the >>>> looping opcodes inside of a UDO space. This implementation is >>>> reading >>>> each point individually, of course with 8 points in the table >>>> it's not >>>> such a problem but it will quickly prove inadequate with larger >>>> sized >>>> tables. I tried reading the table using the phasor to index it over >>>> time, but the results are not fast and if your ultimate >>>> implementation >>>> requires you to get the values "now" for realtime performance, this >>>> may not do. The extra bonus in here to answer your question is >>>> the use >>>> of Anthony Kozar's "max" opcode. >>>> >>>> <CsoundSynthesizer> >>>> <CsOptions> >>>> -m0 -odac -iadc -d -b128 -B256 -Mhw:2,0 -+rtaudio=alsa - >>>> +rtmidi=null >>>> </CsOptions> >>>> <CsInstruments> >>>> >>>> sr = 44100 >>>> ksmps = 128 >>>> nchnls = 2 >>>> >>>> giTab ftgen 1, 0, 8, -2, 1, 5, 2, -4, -9, 8, 0, 4 >>>> >>>> /*--- ---*/ >>>> >>>> instr 1 >>>> ;kndx1 phasor 1/(ftlen(1)) >>>> ;kndx1 = kndx1 * ftlen(1) >>>> >>>> ktab1 table 1, 1 >>>> ktab2 table 2, 1 >>>> ktab3 table 3, 1 >>>> ktab4 table 4, 1 >>>> ktab5 table 5, 1 >>>> ktab6 table 6, 1 >>>> ktab7 table 7, 1 >>>> ktab8 table 8, 1 >>>> >>>> kmax max ktab1, ktab2, ktab3, ktab4, ktab5, ktab6, ktab7, >>>> ktab8 >>>> >>>> printk2 kmax >>>> >>>> endin >>>> >>>> /*--- ---*/ >>>> </CsInstruments> >>>> <CsScore> >>>> i1 0 100 >>>> >>>> </CsScore> >>>> </CsoundSynthesizer> >>>> >>>> On Sun, Jul 6, 2008 at 1:58 PM, joachim heintz >>>> <jh@...> >>>> wrote: >>>>> >>>>> Hello all - >>>>> >>>>> is there an opcode to get the maximum value of a function >>>>> table? E.g. >>>>> for >>>>> the table >>>>> giTab ftgen 0, 0, 8, -2, 1, 5, 2, -4, -9, 8, 0, 4 >>>>> it should return 8. >>>>> >>>>> Thanks - >>>>> >>>>> joachim >>>>> >>>> >>>> >>>> Send bugs reports to this list. >>>> To unsubscribe, send email sympa@... with body >>>> "unsubscribe >>>> csound" >>>> >>> >>> >>> Send bugs reports to this list. >>> To unsubscribe, send email sympa@... with body >>> "unsubscribe >>> csound" >> >> >> >> Send bugs reports to this list. >> To unsubscribe, send email sympa@... with body >> "unsubscribe >> csound" >> > > > Send bugs reports to this list. > To unsubscribe, send email sympa@... with body > "unsubscribe csound" Send bugs reports to this list. To unsubscribe, send email sympa@... with body "unsubscribe csound" |
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Re: Re: Re: Re: Re: Re: Maximum Value in ftables
by Andres Cabrera
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Hi Joachim,
I suspect that the print out shows a temporary calculation and the value is not actually stored for performance, but I'm not sure. If the value is stored, an opcode could be made to consult it. Cheers, Andrés On Mon, Jul 7, 2008 at 3:30 PM, joachim heintz <jh@...> wrote: Thanks, Steven. Very elegant solution. |
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Re: Re: Re: Re: Re: Re: Re: Maximum Value in ftables
by Oeyvind Brandtsegg-2
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For various algorithmic composition purposes it would be good to have
opcodes for this kind of table query. Like ftablemax, ftablemin, ftableaverage... and probably a whole family of related queries. best Oeyvind 2008/7/8, Andres Cabrera <mantaraya36@...>: > Hi Joachim, > I suspect that the print out shows a temporary calculation and the value is > not actually stored for performance, but I'm not sure. If the value is > stored, an opcode could be made to consult it. > > Cheers, > Andrés > > > On Mon, Jul 7, 2008 at 3:30 PM, joachim heintz <jh@...> wrote: > > Thanks, Steven. Very elegant solution. > > In my opinion, the question remains: > > Why doing something again, what csound obviously already has, and prints > out when displaying a function table? > > > > Thanks again and best regards - > > > > joachim > > > > > > Am 07.07.2008 um 21:53 schrieb Steven Yi: > > > > > > > > > > > > > Hi Joachim, > > > > > > Following what I mentioned earlier, here's code for a UDO that will do > > > what are asking about: > > > > > > opcode ftmax,i,i > > > > > > itablenum xin > > > > > > ilen = ftlen(itablenum) > > > > > > imax table 0, itablenum > > > > > > icount = 1 > > > > > > loopStart: > > > > > > itemp table icount, itablenum > > > > > > imax = (itemp > imax) ? itemp : imax > > > > > > icount = icount + 1 > > > > > > if (icount < ilen) goto loopStart > > > > > > xout imax > > > > > > endop > > > > > > steven > > > > > > On Mon, Jul 7, 2008 at 12:22 PM, joachim heintz <jh@...> > wrote: > > > > > > > Thanks to all for the suggestions. I'm just wondering the following: > > > > Each time csound displays a function table, it gives a message like > > > > "ftable 121: 16 points, max 2.670". > > > > So csound knows the maximum value. > > > > I think it would be useful to have an access to this value with an > opcode > > > > like this > > > > > > > > imax ftmax ifn > > > > > > > > (Like ftlen, ftsr and so on.) > > > > > > > > What do you, Steven, and the other developers think about this? > > > > > > > > joachim > > > > > > > > > > > > > > > > Am 06.07.2008 um 21:49 schrieb Steven Yi: > > > > > > > > > > > > > I'd say try using a loop; there's code with this ftreverse UDO to > start > > > > > with: > > > > > > > > > > > http://www.csounds.com/udo/displayOpcode.php?opcode_id=78 > > > > > > > > > > Mixing the loop with David's code should yield something reusable. > =) > > > > > > > > > > On Sun, Jul 6, 2008 at 12:27 PM, David Akbari <dakbari@...> > wrote: > > > > > > > > > > > > > > > > > Hi, > > > > > > > > > > > > This is preallocated for speed, and you may think of something > better. > > > > > > What you might try is setting it up the table indexing using the > > > > > > looping opcodes inside of a UDO space. This implementation is > reading > > > > > > each point individually, of course with 8 points in the table it's > not > > > > > > such a problem but it will quickly prove inadequate with larger > sized > > > > > > tables. I tried reading the table using the phasor to index it > over > > > > > > time, but the results are not fast and if your ultimate > implementation > > > > > > requires you to get the values "now" for realtime performance, > this > > > > > > may not do. The extra bonus in here to answer your question is the > use > > > > > > of Anthony Kozar's "max" opcode. > > > > > > > > > > > > <CsoundSynthesizer> > > > > > > <CsOptions> > > > > > > -m0 -odac -iadc -d -b128 -B256 -Mhw:2,0 -+rtaudio=alsa > -+rtmidi=null > > > > > > </CsOptions> > > > > > > <CsInstruments> > > > > > > > > > > > > sr = 44100 > > > > > > ksmps = 128 > > > > > > nchnls = 2 > > > > > > > > > > > > giTab ftgen 1, 0, 8, -2, 1, 5, 2, -4, -9, 8, 0, 4 > > > > > > > > > > > > /*--- ---*/ > > > > > > > > > > > > instr 1 > > > > > > ;kndx1 phasor 1/(ftlen(1)) > > > > > > ;kndx1 = kndx1 * ftlen(1) > > > > > > > > > > > > ktab1 table 1, 1 > > > > > > ktab2 table 2, 1 > > > > > > ktab3 table 3, 1 > > > > > > ktab4 table 4, 1 > > > > > > ktab5 table 5, 1 > > > > > > ktab6 table 6, 1 > > > > > > ktab7 table 7, 1 > > > > > > ktab8 table 8, 1 > > > > > > > > > > > > kmax max ktab1, ktab2, ktab3, ktab4, ktab5, ktab6, ktab7, > ktab8 > > > > > > > > > > > > printk2 kmax > > > > > > > > > > > > endin > > > > > > > > > > > > /*--- ---*/ > > > > > > </CsInstruments> > > > > > > <CsScore> > > > > > > i1 0 100 > > > > > > > > > > > > </CsScore> > > > > > > </CsoundSynthesizer> > > > > > > > > > > > > On Sun, Jul 6, 2008 at 1:58 PM, joachim heintz > <jh@...> > > > > > > wrote: > > > > > > > > > > > > > > > > > > > > Hello all - > > > > > > > > > > > > > > is there an opcode to get the maximum value of a function table? > E.g. > > > > > > > for > > > > > > > the table > > > > > > > giTab ftgen 0, 0, 8, -2, 1, 5, 2, -4, -9, 8, 0, 4 > > > > > > > it should return 8. > > > > > > > > > > > > > > Thanks - > > > > > > > > > > > > > > joachim > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > Send bugs reports to this list. > > > > > > To unsubscribe, send email sympa@... with body > "unsubscribe > > > > > > csound" > > > > > > > > > > > > > > > > > > > > > > > > > > > Send bugs reports to this list. > > > > > To unsubscribe, send email sympa@... with body > "unsubscribe > > > > > csound" > > > > > > > > > > > > > > > > > > > > > Send bugs reports to this list. > > > > To unsubscribe, send email sympa@... with body > "unsubscribe > > > > csound" > > > > > > > > > > > > > > > > > Send bugs reports to this list. > > > To unsubscribe, send email sympa@... with body "unsubscribe > csound" > > > > > > > > > > > Send bugs reports to this list. > > To unsubscribe, send email sympa@... with body "unsubscribe > csound" > > > > Send bugs reports to this list. To unsubscribe, send email sympa@... with body "unsubscribe csound" |
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Re: Re: Re: Re: Re: Re: Re: Re: Maximum Value in ftables
by Steven Yi
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Hi Oevyind,
Since I already coded up one, the others wouldn't be hard. If you can make a list of useful operations, I can code and add them to the UDO repository. steven On Wed, Jul 9, 2008 at 11:30 AM, Oeyvind Brandtsegg <obrandts@...> wrote: > For various algorithmic composition purposes it would be good to have > opcodes for this kind of table query. Like ftablemax, ftablemin, > ftableaverage... and probably a whole family of related queries. > best > Oeyvind > > 2008/7/8, Andres Cabrera <mantaraya36@...>: >> Hi Joachim, >> I suspect that the print out shows a temporary calculation and the value is >> not actually stored for performance, but I'm not sure. If the value is >> stored, an opcode could be made to consult it. >> >> Cheers, >> Andrés >> >> >> On Mon, Jul 7, 2008 at 3:30 PM, joachim heintz <jh@...> wrote: >> > Thanks, Steven. Very elegant solution. >> > In my opinion, the question remains: >> > Why doing something again, what csound obviously already has, and prints >> out when displaying a function table? >> > >> > Thanks again and best regards - >> > >> > joachim >> > >> > >> > Am 07.07.2008 um 21:53 schrieb Steven Yi: >> > >> > >> > >> > >> > >> > > Hi Joachim, >> > > >> > > Following what I mentioned earlier, here's code for a UDO that will do >> > > what are asking about: >> > > >> > > opcode ftmax,i,i >> > > >> > > itablenum xin >> > > >> > > ilen = ftlen(itablenum) >> > > >> > > imax table 0, itablenum >> > > >> > > icount = 1 >> > > >> > > loopStart: >> > > >> > > itemp table icount, itablenum >> > > >> > > imax = (itemp > imax) ? itemp : imax >> > > >> > > icount = icount + 1 >> > > >> > > if (icount < ilen) goto loopStart >> > > >> > > xout imax >> > > >> > > endop >> > > >> > > steven >> > > >> > > On Mon, Jul 7, 2008 at 12:22 PM, joachim heintz <jh@...> >> wrote: >> > > >> > > > Thanks to all for the suggestions. I'm just wondering the following: >> > > > Each time csound displays a function table, it gives a message like >> > > > "ftable 121: 16 points, max 2.670". >> > > > So csound knows the maximum value. >> > > > I think it would be useful to have an access to this value with an >> opcode >> > > > like this >> > > > >> > > > imax ftmax ifn >> > > > >> > > > (Like ftlen, ftsr and so on.) >> > > > >> > > > What do you, Steven, and the other developers think about this? >> > > > >> > > > joachim >> > > > >> > > > >> > > > >> > > > Am 06.07.2008 um 21:49 schrieb Steven Yi: >> > > > >> > > > >> > > > > I'd say try using a loop; there's code with this ftreverse UDO to >> start >> > > > > with: >> > > > > >> > > > > >> http://www.csounds.com/udo/displayOpcode.php?opcode_id=78 >> > > > > >> > > > > Mixing the loop with David's code should yield something reusable. >> =) >> > > > > >> > > > > On Sun, Jul 6, 2008 at 12:27 PM, David Akbari <dakbari@...> >> wrote: >> > > > > >> > > > > > >> > > > > > Hi, >> > > > > > >> > > > > > This is preallocated for speed, and you may think of something >> better. >> > > > > > What you might try is setting it up the table indexing using the >> > > > > > looping opcodes inside of a UDO space. This implementation is >> reading >> > > > > > each point individually, of course with 8 points in the table it's >> not >> > > > > > such a problem but it will quickly prove inadequate with larger >> sized >> > > > > > tables. I tried reading the table using the phasor to index it >> over >> > > > > > time, but the results are not fast and if your ultimate >> implementation >> > > > > > requires you to get the values "now" for realtime performance, >> this >> > > > > > may not do. The extra bonus in here to answer your question is the >> use >> > > > > > of Anthony Kozar's "max" opcode. >> > > > > > >> > > > > > <CsoundSynthesizer> >> > > > > > <CsOptions> >> > > > > > -m0 -odac -iadc -d -b128 -B256 -Mhw:2,0 -+rtaudio=alsa >> -+rtmidi=null >> > > > > > </CsOptions> >> > > > > > <CsInstruments> >> > > > > > >> > > > > > sr = 44100 >> > > > > > ksmps = 128 >> > > > > > nchnls = 2 >> > > > > > >> > > > > > giTab ftgen 1, 0, 8, -2, 1, 5, 2, -4, -9, 8, 0, 4 >> > > > > > >> > > > > > /*--- ---*/ >> > > > > > >> > > > > > instr 1 >> > > > > > ;kndx1 phasor 1/(ftlen(1)) >> > > > > > ;kndx1 = kndx1 * ftlen(1) >> > > > > > >> > > > > > ktab1 table 1, 1 >> > > > > > ktab2 table 2, 1 >> > > > > > ktab3 table 3, 1 >> > > > > > ktab4 table 4, 1 >> > > > > > ktab5 table 5, 1 >> > > > > > ktab6 table 6, 1 >> > > > > > ktab7 table 7, 1 >> > > > > > ktab8 table 8, 1 >> > > > > > >> > > > > > kmax max ktab1, ktab2, ktab3, ktab4, ktab5, ktab6, ktab7, >> ktab8 >> > > > > > >> > > > > > printk2 kmax >> > > > > > >> > > > > > endin >> > > > > > >> > > > > > /*--- ---*/ >> > > > > > </CsInstruments> >> > > > > > <CsScore> >> > > > > > i1 0 100 >> > > > > > >> > > > > > </CsScore> >> > > > > > </CsoundSynthesizer> >> > > > > > >> > > > > > On Sun, Jul 6, 2008 at 1:58 PM, joachim heintz >> <jh@...> >> > > > > > wrote: >> > > > > > >> > > > > > > >> > > > > > > Hello all - >> > > > > > > >> > > > > > > is there an opcode to get the maximum value of a function table? >> E.g. >> > > > > > > for >> > > > > > > the table >> > > > > > > giTab ftgen 0, 0, 8, -2, 1, 5, 2, -4, -9, 8, 0, 4 >> > > > > > > it should return 8. >> > > > > > > >> > > > > > > Thanks - >> > > > > > > >> > > > > > > joachim >> > > > > > > >> > > > > > > >> > > > > > >> > > > > > >> > > > > > Send bugs reports to this list. >> > > > > > To unsubscribe, send email sympa@... with body >> "unsubscribe >> > > > > > csound" >> > > > > > >> > > > > > >> > > > > >> > > > > >> > > > > Send bugs reports to this list. >> > > > > To unsubscribe, send email sympa@... with body >> "unsubscribe >> > > > > csound" >> > > > > >> > > > >> > > > >> > > > >> > > > Send bugs reports to this list. >> > > > To unsubscribe, send email sympa@... with body >> "unsubscribe >> > > > csound" >> > > > >> > > > >> > > >> > > >> > > Send bugs reports to this list. >> > > To unsubscribe, send email |
