Re: [Scilab-users] Scilab control after an impossible calculation
For that matter, you can pass a vector of infemums and supremums for each element of the vector you're optimizing. (and +inf and -inf work, for things that don't matter). As long as you can optimize within a rectilinear space then you can easily dodge the "bad" values. It's in the help for optim. On Thu, 2016-10-06 at 13:12 +0200, Serge Steer wrote: > If you use optim you can set the ind retured arg to -1 in the cost > function to say that the function cannot be evaluated at this point. > > Serge > > Le 06/10/2016 à 10:51, paul.carr...@free.fr a écrit : > > > Hi All > > > > > > > > I’m using Scilab as the interface between my optimizer and my finite > > element solver(s) and sometimes Scilab stops because of unexpected > > and impossible calculus (1/x with x = 0 as an example ); obviously > > Scilab stops (and so the optimization). > > > > > > > > I’m wondering if it’s possible: > > > > - To ask back Scilab a message such as “hey I crashed > > because you’re a fool and you’ve not anticipated an impossible > > calculation !!!” > > > > - To get back Scilab control in order to avoid optimization > > process crash ? I’ve been thinking in affecting a cost function > > value at %inf for example (not elegant I recognize) > > > > > > > > I don’t know if I’m understandable enough … > > > > > > > > Paul > > > > > > > > > > ___ > > 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 -- Tim Wescott www.wescottdesign.com Control & Communications systems, circuit & software design. Phone: 503.631.7815 Cell: 503.349.8432 ___ users mailing list users@lists.scilab.org http://lists.scilab.org/mailman/listinfo/users
Re: [Scilab-users] Scilab control after an impossible calculation
Le 06/10/2016 12:31, paul.carr...@free.fr a écrit : thanks for the advice well I tried but it does not work as expected ; errcatch seems to be obsolete so I'm testing it with execstr: the warning is not displayed ... why Try / catch / end was very buggy in Scilab 5. Scilab 6 efficiently fixes all (or at least most of) reported errors-handling errors. It is now reliable. It is one of the great reliefs provided by Scilab 6. ___ users mailing list users@lists.scilab.org http://lists.scilab.org/mailman/listinfo/users
Re: [Scilab-users] Scilab control after an impossible calculation
thanks everybody for the supports
Paul
- Mail original -
De: "Mike Page" <mike.page...@googlemail.com>
À: "Users mailing list for Scilab" <users@lists.scilab.org>
Envoyé: Jeudi 6 Octobre 2016 12:34:59
Objet: Re: [Scilab-users] Scilab control after an impossible calculation
Hi Paul,
Would Scilab's try-catch block do what you want? For example:
for i=1:10;
try;
disp(1/(i-5));
catch;
disp("err");
end;
end
won't crash when it gets to the divide by zero.
This is the more structured way, but you can use execstr with errcatch to do
the same thing.
HTH
Mike.
On 6 October 2016 at 09:51, < paul.carr...@free.fr > wrote:
Hi All
I’m using Scilab as the interface between my optimizer and my finite element
solver(s) and sometimes Scilab stops because of unexpected and impossible
calculus (1/x with x = 0 as an example ); obviously Scilab stops (and so the
optimization).
I’m wondering if it’s possible:
- To ask back Scilab a message such as “hey I crashed because you’re a fool and
you’ve not anticipated an impossible calculation !!!”
- To get back Scilab control in order to avoid optimization process crash ?
I’ve been thinking in affecting a cost function value at %inf for example (not
elegant I recognize)
I don’t know if I’m understandable enough …
Paul
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Re: [Scilab-users] Scilab control after an impossible calculation
If you use optim you can set the ind retured arg to -1 in the cost function to say that the function cannot be evaluated at this point. Serge Le 06/10/2016 à 10:51, paul.carr...@free.fr a écrit : Hi All I’m using Scilab as the interface between my optimizer and my finite element solver(s) and sometimes Scilab stops because of unexpected and impossible calculus (1/x with x = 0 as an example ); obviously Scilab stops (and so the optimization). I’m wondering if it’s possible: -To ask back Scilab a message such as “hey I crashed because you’re a fool and you’ve not anticipated an impossible calculation !!!” -To get back Scilab control in order to avoid optimization process crash ? I’ve been thinking in affecting a cost function value at %inf for example (not elegant I recognize) I don’t know if I’m understandable enough … Paul ___ 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] Scilab control after an impossible calculation
Hi Paul,
Would Scilab's try-catch block do what you want? For example:
for i=1:10;
try;
disp(1/(i-5));
catch;
disp("err");
end;
end
won't crash when it gets to the divide by zero.
This is the more structured way, but you can use execstr with errcatch to
do the same thing.
HTH
Mike.
On 6 October 2016 at 09:51, wrote:
> Hi All
>
>
>
> I’m using Scilab as the interface between my optimizer and my finite
> element solver(s) and sometimes Scilab stops because of unexpected and
> impossible calculus (1/x with x = 0 as an example ); obviously Scilab stops
> (and so the optimization).
>
>
>
> I’m wondering if it’s possible:
>
> - To ask back Scilab a message such as “hey I crashed because
> you’re a fool and you’ve not anticipated an impossible calculation !!!”
>
> - To get back Scilab control in order to avoid optimization
> process crash ? I’ve been thinking in affecting a cost function value at
> %inf for example (not elegant I recognize)
>
>
>
> I don’t know if I’m understandable enough …
>
>
>
> Paul
>
> ___
> users mailing list
> users@lists.scilab.org
> http://lists.scilab.org/mailman/listinfo/users
>
>
___
users mailing list
users@lists.scilab.org
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Re: [Scilab-users] Scilab control after an impossible calculation
thanks for the advice
well I tried but it does not work as expected ; errcatch seems to be obsolete
so I'm testing it with execstr: the warning is not displayed ... why
###
mode(0)
try
x = 0;
y = (1/x)
if execstr(('y','errcatch') <> 0) then
printf("you''re a fool\n");
else
printf("Everything is going well\n");
end
errclear;
end
- Mail original -
De: "Jens Simon Strom" <j.s.st...@hslmg.de>
À: "Users mailing list for Scilab" <users@lists.scilab.org>
Envoyé: Jeudi 6 Octobre 2016 11:48:50
Objet: Re: [Scilab-users] Scilab control after an impossible calculation
Try errcatch ().
Am 06.10.2016 10:51, schrieb paul.carr...@free.fr :
Hi All
I’m using Scilab as the interface between my optimizer and my finite element
solver(s) and sometimes Scilab stops because of unexpected and impossible
calculus (1/x with x = 0 as an example ); obviously Scilab stops (and so the
optimization).
I’m wondering if it’s possible:
- To ask back Scilab a message such as “hey I crashed because you’re a fool and
you’ve not anticipated an impossible calculation !!!”
- To get back Scilab control in order to avoid optimization process crash ?
I’ve been thinking in affecting a cost function value at %inf for example (not
elegant I recognize)
I don’t know if I’m understandable enough …
Paul
___
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
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Re: [Scilab-users] Scilab control after an impossible calculation
Try errcatch(). Am 06.10.2016 10:51, schrieb paul.carr...@free.fr: Hi All I'm using Scilab as the interface between my optimizer and my finite element solver(s) and sometimes Scilab stops because of unexpected and impossible calculus (1/x with x = 0 as an example ); obviously Scilab stops (and so the optimization). I'm wondering if it's possible: -To ask back Scilab a message such as "hey I crashed because you're a fool and you've not anticipated an impossible calculation !!!" -To get back Scilab control in order to avoid optimization process crash ? I've been thinking in affecting a cost function value at %inf for example (not elegant I recognize) I don't know if I'm understandable enough ... Paul ___ 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
[Scilab-users] Scilab control after an impossible calculation
Hi All I’m using Scilab as the interface between my optimizer and my finite element solver(s) and sometimes Scilab stops because of unexpected and impossible calculus (1/x with x = 0 as an example ); obviously Scilab stops (and so the optimization). I’m wondering if it’s possible: - To ask back Scilab a message such as “hey I crashed because you’re a fool and you’ve not anticipated an impossible calculation !!!” - To get back Scilab control in order to avoid optimization process crash ? I’ve been thinking in affecting a cost function value at %inf for example (not elegant I recognize) I don’t know if I’m understandable enough … Paul___ users mailing list users@lists.scilab.org http://lists.scilab.org/mailman/listinfo/users
