apparent problems with if-then-elseif structure

apparent problems with if-then-elseif structure

Date	2016-01-14 16:50
From	Karin Daum
Subject	apparent problems with if-then-elseif structure
	I'm still investigating the performance of the different multichannel panning methods. For this purpose I'm just writing a program which allows me also to visualise the behaviour of the different methods. This is my first program in Csound. Now I realise that something goes wrong with the if-then-else(if) structure in Csound. Below you find a simple test program which shows the effect: sr = 44100 ksmps = 128 nchnls = 2 0dbfs = 1 gkMethod init 0 instr 1 printf "Method: %d \n",1,gkMethod if gkMethod== 0 then iInst1 = 12 iInst2 = 0 elseif gkMethod == 1 then giorder = 1 iInst1 = 10 iInst2 = 11 else iInst1 = 20 iInst2 = 21 endif print iInst1, iInst2 endin i 1 0 1 e I would expect that the code between then-else or else-endif is executed only if the corresponding condition is true which means in this example I would expect as result iInst1=12 and iInst2=0 however the result with both, CsoundQt and Csound is: new alloc for instr 1: instr 1: iInst1 = 20.000 iInst2 = 21.000 Method: 0 Or did I miss something? cheers, Karin 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

Date	2016-01-14 17:02
From	Rory Walsh
Subject	Re: apparent problems with if-then-elseif structure
	Been there, asked that: http://csound.1045644.n5.nabble.com/if-then-problem-td1099335.html#a1099336 On 14 January 2016 at 16:50, Karin Daum <karin.daum@desy.de> wrote: I'm still investigating the performance of the different multichannel panning methods. For this purpose I'm just writing a program which allows me also to visualise the behaviour of the different methods. This is my first program in Csound. Now I realise that something goes wrong with the if-then-else(if) structure in Csound. Below you find a simple test program which shows the effect: <CsoundSynthesizer> <CsOptions> </CsOptions> <CsInstruments> sr = 44100 ksmps = 128 nchnls = 2 0dbfs = 1 gkMethod init 0 instr 1 printf "Method: %d \n",1,gkMethod if gkMethod== 0 then iInst1 = 12 iInst2 = 0 elseif gkMethod == 1 then giorder = 1 iInst1 = 10 iInst2 = 11 else iInst1 = 20 iInst2 = 21 endif print iInst1, iInst2 endin </CsInstruments> <CsScore> i 1 0 1 e </CsScore> I would expect that the code between then-else or else-endif is executed only if the corresponding condition is true which means in this example I would expect as result iInst1=12 and iInst2=0 however the result with both, CsoundQt and Csound is: new alloc for instr 1: instr 1: iInst1 = 20.000 iInst2 = 21.000 Method: 0 Or did I miss something? cheers, Karin 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 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

Date	2016-01-14 17:02
From	Steven Yi
Subject	Re: apparent problems with if-then-elseif structure
	if-then's can be tricky in csound due to rates. The issue here I see is that you are doing a k-rate comparison but also have I-time code. I would suggest doing something like: imethod = i(gkMethod) if imethod == 1 then elseif ... else... endif Typically it's best to always match up the rate of the conditions to each other and to the code within the branches. On Thu, Jan 14, 2016 at 11:50 AM, Karin Daum wrote: > I'm still investigating the performance of the different multichannel panning methods. For this purpose I'm just writing a program which allows me also to visualise the behaviour of the different methods. This is my first program in Csound. Now I realise that something goes wrong with the if-then-else(if) structure in Csound. Below you find a simple test program which shows the effect: > > > > > > sr = 44100 > ksmps = 128 > nchnls = 2 > 0dbfs = 1 > gkMethod init 0 > > instr 1 > printf "Method: %d \n",1,gkMethod > if gkMethod== 0 then > iInst1 = 12 > iInst2 = 0 > elseif gkMethod == 1 then > giorder = 1 > iInst1 = 10 > iInst2 = 11 > else > iInst1 = 20 > iInst2 = 21 > endif > print iInst1, iInst2 > endin > > > i 1 0 1 > e > > > I would expect that the code between then-else or else-endif is executed only if the corresponding condition is true which means in this example I would expect as result iInst1=12 and iInst2=0 however the result with both, CsoundQt and Csound is: > > new alloc for instr 1: > instr 1: iInst1 = 20.000 iInst2 = 21.000 > Method: 0 > > Or did I miss something? > > cheers, > > Karin > > 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 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

Date	2016-01-14 17:03
From	Rory Walsh
Subject	Re: apparent problems with if-then-elseif structure
	You can skip my post and just read Istvan's answer. On 14 January 2016 at 17:02, Rory Walsh <rorywalsh@ear.ie> wrote: Been there, asked that: http://csound.1045644.n5.nabble.com/if-then-problem-td1099335.html#a1099336 On 14 January 2016 at 16:50, Karin Daum <karin.daum@desy.de> wrote: I'm still investigating the performance of the different multichannel panning methods. For this purpose I'm just writing a program which allows me also to visualise the behaviour of the different methods. This is my first program in Csound. Now I realise that something goes wrong with the if-then-else(if) structure in Csound. Below you find a simple test program which shows the effect: <CsoundSynthesizer> <CsOptions> </CsOptions> <CsInstruments> sr = 44100 ksmps = 128 nchnls = 2 0dbfs = 1 gkMethod init 0 instr 1 printf "Method: %d \n",1,gkMethod if gkMethod== 0 then iInst1 = 12 iInst2 = 0 elseif gkMethod == 1 then giorder = 1 iInst1 = 10 iInst2 = 11 else iInst1 = 20 iInst2 = 21 endif print iInst1, iInst2 endin </CsInstruments> <CsScore> i 1 0 1 e </CsScore> I would expect that the code between then-else or else-endif is executed only if the corresponding condition is true which means in this example I would expect as result iInst1=12 and iInst2=0 however the result with both, CsoundQt and Csound is: new alloc for instr 1: instr 1: iInst1 = 20.000 iInst2 = 21.000 Method: 0 Or did I miss something? cheers, Karin 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 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

Date	2016-01-14 17:32
From	Karin Daum
Subject	Re: apparent problems with if-then-elseif structure
	thanks, it’s really tricky when starting with Csound with these different rate On 14 Jan 2016, at 18:03, Rory Walsh <rorywalsh@EAR.IE> wrote: You can skip my post and just read Istvan's answer. On 14 January 2016 at 17:02, Rory Walsh <rorywalsh@ear.ie> wrote: Been there, asked that: http://csound.1045644.n5.nabble.com/if-then-problem-td1099335.html#a1099336 On 14 January 2016 at 16:50, Karin Daum <karin.daum@desy.de> wrote: I'm still investigating the performance of the different multichannel panning methods. For this purpose I'm just writing a program which allows me also to visualise the behaviour of the different methods. This is my first program in Csound. Now I realise that something goes wrong with the if-then-else(if) structure in Csound. Below you find a simple test program which shows the effect: <CsoundSynthesizer> <CsOptions> </CsOptions> <CsInstruments> sr = 44100 ksmps = 128 nchnls = 2 0dbfs = 1 gkMethod init 0 instr 1 printf "Method: %d \n",1,gkMethod if gkMethod== 0 then iInst1 = 12 iInst2 = 0 elseif gkMethod == 1 then giorder = 1 iInst1 = 10 iInst2 = 11 else iInst1 = 20 iInst2 = 21 endif print iInst1, iInst2 endin </CsInstruments> <CsScore> i 1 0 1 e </CsScore> I would expect that the code between then-else or else-endif is executed only if the corresponding condition is true which means in this example I would expect as result iInst1=12 and iInst2=0 however the result with both, CsoundQt and Csound is: new alloc for instr 1: instr 1: iInst1 = 20.000 iInst2 = 21.000 Method: 0 Or did I miss something? cheers, Karin 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 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

Date	2016-01-14 18:06
From	Rory Walsh
Subject	Re: apparent problems with if-then-elseif structure
	Agreed! I'm still getting caught out with these things many years later ;) On 14 January 2016 at 17:32, Karin Daum <karin.daum@desy.de> wrote: thanks, it’s really tricky when starting with Csound with these different rate On 14 Jan 2016, at 18:03, Rory Walsh <rorywalsh@EAR.IE> wrote: You can skip my post and just read Istvan's answer. On 14 January 2016 at 17:02, Rory Walsh <rorywalsh@ear.ie> wrote: Been there, asked that: http://csound.1045644.n5.nabble.com/if-then-problem-td1099335.html#a1099336 On 14 January 2016 at 16:50, Karin Daum <karin.daum@desy.de> wrote: I'm still investigating the performance of the different multichannel panning methods. For this purpose I'm just writing a program which allows me also to visualise the behaviour of the different methods. This is my first program in Csound. Now I realise that something goes wrong with the if-then-else(if) structure in Csound. Below you find a simple test program which shows the effect: <CsoundSynthesizer> <CsOptions> </CsOptions> <CsInstruments> sr = 44100 ksmps = 128 nchnls = 2 0dbfs = 1 gkMethod init 0 instr 1 printf "Method: %d \n",1,gkMethod if gkMethod== 0 then iInst1 = 12 iInst2 = 0 elseif gkMethod == 1 then giorder = 1 iInst1 = 10 iInst2 = 11 else iInst1 = 20 iInst2 = 21 endif print iInst1, iInst2 endin </CsInstruments> <CsScore> i 1 0 1 e </CsScore> I would expect that the code between then-else or else-endif is executed only if the corresponding condition is true which means in this example I would expect as result iInst1=12 and iInst2=0 however the result with both, CsoundQt and Csound is: new alloc for instr 1: instr 1: iInst1 = 20.000 iInst2 = 21.000 Method: 0 Or did I miss something? cheers, Karin 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 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 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 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