Re: [Scilab-users] Strange list error
On 2014-01-27 22:43, Serge Steer wrote: Le 27/01/2014 19:05, Stefan Du Rietz a écrit : Hello Paul, after trying like a maniac ;-) I finally managed to reproduce it! The error shows up only when you run the command from the command window after a pause in the attached function testlisterror.sci. --testlisterror(pnonfast,nonfast) -1-args(1) = null() args(1) = null() !--error 44 Wrong argument #2. Without the pause it works OK. Regards Stefan Under pause, you cannot modify a variable which is defined in the calling context so in such a context args is not a list as you expect but an empty array which is implicitely created To make it work you must do -1- args; //makes a local copy of args -1-args(1) = null() Serge What do you mean by defined in the calling context? I can modify this: -1-isfast isfast = 0.0. -1-isfast(1) = 1 isfast = 1.0. Stefan ___ users mailing list users@lists.scilab.org http://lists.scilab.org/mailman/listinfo/users
Re: [Scilab-users] Strange list error
On 28/01/2014 09:41, Stefan Du Rietz wrote: On 2014-01-27 22:43, Serge Steer wrote: Le 27/01/2014 19:05, Stefan Du Rietz a écrit : Hello Paul, after trying like a maniac ;-) I finally managed to reproduce it! The error shows up only when you run the command from the command window after a pause in the attached function testlisterror.sci. --testlisterror(pnonfast,nonfast) -1-args(1) = null() args(1) = null() !--error 44 Wrong argument #2. Without the pause it works OK. Regards Stefan Under pause, you cannot modify a variable which is defined in the calling context so in such a context args is not a list as you expect but an empty array which is implicitely created To make it work you must do -1- args; //makes a local copy of args -1-args(1) = null() Serge What do you mean by defined in the calling context? I can modify this: -1-isfast isfast = 0.0. -1-isfast(1) = 1 isfast = 1.0. Stefan Stefan, you may want to have a look at http://wiki.scilab.org/howto/global%20and%20local%20variables This page explains what Serge means i believe. Adrien ___ users mailing list users@lists.scilab.org http://lists.scilab.org/mailman/listinfo/users -- Adrien Vogt-Schilb PhD Student (Cired) ___ users mailing list users@lists.scilab.org http://lists.scilab.org/mailman/listinfo/users
Re: [Scilab-users] Strange list error
On 28/01/2014 16:43, Stefan Du Rietz wrote: On 2014-01-28 09:54, Adrien Vogt-Schilb wrote: On 28/01/2014 09:41, Stefan Du Rietz wrote: On 2014-01-27 22:43, Serge Steer wrote: Le 27/01/2014 19:05, Stefan Du Rietz a écrit : Under pause, you cannot modify a variable which is defined in the calling context so in such a context args is not a list as you expect but an empty array which is implicitely created To make it work you must do -1- args; //makes a local copy of args -1-args(1) = null() Serge What do you mean by defined in the calling context? I can modify this: -1-isfast isfast = 0.0. -1-isfast(1) = 1 isfast = 1.0. Stefan Stefan, you may want to have a look at http://wiki.scilab.org/howto/global%20and%20local%20variables This page explains what Serge means i believe. Adrien Thank you Adrien, but I have had many looks at it ;-) I still don't understand the difference between my variables args and isfast. They are both defined in the function. args: input values of the function are assigned to the corresponding local variables of the function (local variables and scoping 5.) isfast: local variables defined at level_N remain local at that level. (local variables and scoping 2.). What am I missing? Am I just stupid? Stefan I believe the local and global variable stuff explains why you are able to reproduce your bug only under pause, as documented here http://wiki.scilab.org/howto/global%20and%20local%20variables (gosh, the page does not explain that pause and functions behave the same way... this is probably our problem here) This means that there is not strange list error, only a confusing behaviour of scilab under pause. If i am correct, none of your functions suddenly stopped working. Coming back to the original post: -1-args(1) = null(); args(1) = null(); !--error 44 Wrong argument #2. and when I checked: -1-typeof(args) ans = list Can anybody explain that? The explanation is that you just created a new pause environment, where args do no exist yet. The line -1-args(1) = null(); (witten just after entering in pause) then behaves exactly the same way as if you open a new scilab consoloe and write args(1) = null() In other words, you cannot debug your function using pause like that. In the precise case of your function, one thing that would work is to pause the function just after entering (before the line args = varargin;), or to use the solution Serge gave you, that is replace the lines 8 and 9 pause args(1) = null(); with pause args; //makes a local copy of args in the new pause environment args(1) = null(); Please make sure you understand that nothing discussed here as nothing to do with your function, (which i did not read and i bet serge did not read). The bug comes from how you use pause to try to debug your function (and yes, this is very annoying as it prevents to use pause to debug scilab seamlessly.). I'm confused whether this answer your original question, and whether you have more questions Adrien ___ users mailing list users@lists.scilab.org http://lists.scilab.org/mailman/listinfo/users
Re: [Scilab-users] Strange list error
Hello Paul, after trying like a maniac ;-) I finally managed to reproduce it! The error shows up only when you run the command from the command window after a pause in the attached function testlisterror.sci. --testlisterror(pnonfast,nonfast) -1-args(1) = null() args(1) = null() !--error 44 Wrong argument #2. Without the pause it works OK. Regards Stefan On 2014-01-27 08:47, Paul Bignier wrote: Hello Stefan, What do you mean by suddenly stopped working? Did you switch Scilab versions? Could you provide us the failing test case? When I type args = list(); args(1)=null() it runs smooth. Regards, Paul On 01/25/2014 09:07 PM, Stefan Du Rietz wrote: I found out what the error was: I had a line if exists(bolus) then that became true when I had this variable in the workspace, which I never had before. I changed it to if exists(bolus, l) then and it worked again. But I still wonder: why the error 44? Stefan On 2014-01-25 18:32, Stefan Du Rietz wrote: Hi all, one of my functions suddenly stopped working. During my effort to find the error by running the commands from the command window, I experienced this: -1-args(1) = null(); args(1) = null(); !--error 44 Wrong argument #2. and when I checked: -1-typeof(args) ans = list Can anybody explain that? Regards Stefan ___ users mailing list users@lists.scilab.org http://lists.scilab.org/mailman/listinfo/users ___ users mailing list users@lists.scilab.org http://lists.scilab.org/mailman/listinfo/users testlisterror.sci Description: application/scilab ___ users mailing list users@lists.scilab.org http://lists.scilab.org/mailman/listinfo/users
Re: [Scilab-users] Strange list error
PS --testlisterror(pnonfast,nonfast) works OK also after resume twice. /Stefan On 2014-01-27 19:05, Stefan Du Rietz wrote: Hello Paul, after trying like a maniac ;-) I finally managed to reproduce it! The error shows up only when you run the command from the command window after a pause in the attached function testlisterror.sci. --testlisterror(pnonfast,nonfast) -1-args(1) = null() args(1) = null() !--error 44 Wrong argument #2. Without the pause it works OK. Regards Stefan On 2014-01-27 08:47, Paul Bignier wrote: Hello Stefan, What do you mean by suddenly stopped working? Did you switch Scilab versions? Could you provide us the failing test case? When I type args = list(); args(1)=null() it runs smooth. Regards, Paul On 01/25/2014 09:07 PM, Stefan Du Rietz wrote: I found out what the error was: I had a line if exists(bolus) then that became true when I had this variable in the workspace, which I never had before. I changed it to if exists(bolus, l) then and it worked again. But I still wonder: why the error 44? Stefan On 2014-01-25 18:32, Stefan Du Rietz wrote: Hi all, one of my functions suddenly stopped working. During my effort to find the error by running the commands from the command window, I experienced this: -1-args(1) = null(); args(1) = null(); !--error 44 Wrong argument #2. and when I checked: -1-typeof(args) ans = list Can anybody explain that? Regards Stefan ___ users mailing list users@lists.scilab.org http://lists.scilab.org/mailman/listinfo/users ___ users mailing list users@lists.scilab.org http://lists.scilab.org/mailman/listinfo/users ___ users mailing list users@lists.scilab.org http://lists.scilab.org/mailman/listinfo/users ___ users mailing list users@lists.scilab.org http://lists.scilab.org/mailman/listinfo/users
Re: [Scilab-users] Strange list error
Le 27/01/2014 19:05, Stefan Du Rietz a écrit : Hello Paul, after trying like a maniac ;-) I finally managed to reproduce it! The error shows up only when you run the command from the command window after a pause in the attached function testlisterror.sci. --testlisterror(pnonfast,nonfast) -1-args(1) = null() args(1) = null() !--error 44 Wrong argument #2. Without the pause it works OK. Regards Stefan Under pause, you cannot modify a variable which is defined in the calling context so in such a context args is not a list as you expect but an empty array which is implicitely created To make it work you must do -1- args; //makes a local copy of args -1-args(1) = null() Serge ___ users mailing list users@lists.scilab.org http://lists.scilab.org/mailman/listinfo/users
Re: [Scilab-users] Strange list error
Hello Stefan, What do you mean by suddenly stopped working? Did you switch Scilab versions? Could you provide us the failing test case? When I type args = list(); args(1)=null() it runs smooth. Regards, Paul On 01/25/2014 09:07 PM, Stefan Du Rietz wrote: I found out what the error was: I had a line if exists(bolus) then that became true when I had this variable in the workspace, which I never had before. I changed it to if exists(bolus, l) then and it worked again. But I still wonder: why the error 44? Stefan On 2014-01-25 18:32, Stefan Du Rietz wrote: Hi all, one of my functions suddenly stopped working. During my effort to find the error by running the commands from the command window, I experienced this: -1-args(1) = null(); args(1) = null(); !--error 44 Wrong argument #2. and when I checked: -1-typeof(args) ans = list Can anybody explain that? Regards Stefan ___ users mailing list users@lists.scilab.org http://lists.scilab.org/mailman/listinfo/users ___ users mailing list users@lists.scilab.org http://lists.scilab.org/mailman/listinfo/users -- Paul BIGNIER Scilab Engineer Xcos Developer --- Scilab Enterprises 143bis rue Yves Le Coz - 78000 Versailles, France Phone: +33.1.80.77.04.69 http://www.scilab-enterprises.com ___ users mailing list users@lists.scilab.org http://lists.scilab.org/mailman/listinfo/users
[Scilab-users] Strange list error
Hi all, one of my functions suddenly stopped working. During my effort to find the error by running the commands from the command window, I experienced this: -1-args(1) = null(); args(1) = null(); !--error 44 Wrong argument #2. and when I checked: -1-typeof(args) ans = list Can anybody explain that? Regards Stefan ___ users mailing list users@lists.scilab.org http://lists.scilab.org/mailman/listinfo/users
Re: [Scilab-users] Strange list error
I found out what the error was: I had a line if exists(bolus) then that became true when I had this variable in the workspace, which I never had before. I changed it to if exists(bolus, l) then and it worked again. But I still wonder: why the error 44? Stefan On 2014-01-25 18:32, Stefan Du Rietz wrote: Hi all, one of my functions suddenly stopped working. During my effort to find the error by running the commands from the command window, I experienced this: -1-args(1) = null(); args(1) = null(); !--error 44 Wrong argument #2. and when I checked: -1-typeof(args) ans = list Can anybody explain that? Regards Stefan ___ users mailing list users@lists.scilab.org http://lists.scilab.org/mailman/listinfo/users ___ users mailing list users@lists.scilab.org http://lists.scilab.org/mailman/listinfo/users
